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Super Mario Odyssey: A Modern Classic of Playful Design

Super Mario Odyssey (2017) marks one of Nintendo’s most inventive entries in the long-running Mario franchise. It balances nostalgia and novelty, offering a sandbox-style adventure that both honors series traditions and pushes Mario into fresh creative territory. The game’s design—its movement systems, level structure, and playful mechanics—makes it an instructive example of modern game design that prizes player agency, discovery, and a sense of wonder.

Origins and Design Ambition From its earliest announcements, Odyssey signaled a shift away from linear platforming toward open-ended spaces encouraging exploration. The core ambition was to recapture the thrill of discovery exemplified by Super Mario 64 while integrating decades of Mario’s mechanical refinements. The development team leaned on Miyamoto’s legacy of joyful experimentation: levels as toys rather than tests, systems that invite improvisation, and an aesthetic that signals possibility.

Cappy: A Mechanical and Narrative Pivot The introduction of Cappy, a sentient hat that Mario can throw to possess enemies and objects, functions as Odyssey’s central innovation. Mechanically, Cappy expands Mario’s repertoire beyond jumps and run-based acrobatics into possession-based problem solving. This creates emergent gameplay: combining captures and platforming leads to surprising solutions and momentary delight. Narratively, Cappy provides companionship and motivation—an emotionally light yet effective throughline that contrasts with the series’ often minimal plots.

Kingdoms as Curated Playgrounds Each kingdom in Odyssey acts as a curated play space with its own rules, geometry, and character. Rather than being mere backdrops for levels, the kingdoms are design experiments: the Metro Kingdom’s vertical urbanity shifts emphasis toward traversal and NPC interaction; the Sand Kingdom emphasizes momentum and vertical navigation; the Luncheon Kingdom turns scale and texture into playful obstacles. The consistent presence of Power Moons as collectible goals creates an open-ended reward loop—players pursue dozens of small, satisfying tasks rather than a few long, arduous objectives.

Movement and Mastery Movement in Odyssey is finely tuned. Mario’s control responsiveness, nuanced jump arcs, and the added mobility from cap throws and captures give players a toolbox for expression. The game supports multiple skill levels gracefully: newcomers can enjoy straightforward platforming and story beats, while experienced players can chase sequence breaks, speedrun routes, and tech-rich maneuvers. This layered design—accessible core mechanics with deep emergent mastery—defines a hallmark of great game systems.

Aesthetic Playfulness and World-Building Odyssey’s visual and auditory design reinforce its playful tone. Each kingdom’s theme is established quickly through art direction and soundtrack; the music often combines orchestral weight with jaunty motifs that make exploration feel celebratory. Environmental details and NPC interactions populate the world with small, characterful moments that reward curiosity. The game’s blend of realistic textures (a bustling city, edible landscapes) with surreal twists (giant fish as taxis, living hats) creates a consistent sense of whimsy.

Risk, Reward, and Player Freedom Unlike linear platformers that gate progression behind precise mastery, Odyssey disperses rewards through diverse tasks: environmental puzzles, platforming challenges, hidden secrets, and performance-based objectives. This diversification reduces the penalty of failure, encouraging experimentation. Players can approach objectives in multiple ways—stealth, capture, platforming, or environmental manipulation—which reinforces the game’s core message: play how you want.

Cultural Impact and Legacy Odyssey revitalized critical and commercial appreciation for Mario in the late 2010s. Its open-ended kingdoms and the Cappy mechanic influenced subsequent design conversations around player agency in AAA platformers. Moreover, Odyssey demonstrated that mainstream console titles could be at once broadly accessible and mechanically deep—a blueprint for balancing approachability with emergent gameplay.

Conclusion Super Mario Odyssey stands out because it treats its player as an explorer and a creative agent. Its charm comes not just from polished controls and beautiful presentation but from a design philosophy that privileges playful possibility. In a landscape increasingly focused on systems and progression loops, Odyssey is a reminder that the simplest goal—making play feel delightful—remains one of the most powerful design ambitions in games.

Final Verdict: Which Format Should You Actually Use?

Here is the TL;DR for anyone overwhelmed by the options.

  • For PC Emulation: Download or convert to NSZ. The space savings are worth the marginal decompression overhead.
  • For Modded Switch (Atmosphere): Use NSZ for installation. Keep a copy of the XCI for archival purposes if you want a 1:1 cartridge backup.
  • For SX OS (Legacy): Stick with XCI. SX OS has buggy NSZ support.
  • For Sharing with Friends (Legal backups only): Use NSZ – smaller file size means easier transfers.

Super Mario Odyssey remains a masterpiece of 3D platforming. Using modern file formats like NSZ ensures that whether you are replaying the Cascade Kingdom on a Steam Deck via Yuzu or exploring the Moon Kingdom on your modded Switch, the experience is smooth, fast, and storage-efficient. Just remember to respect the developers who crafted this adventure by obtaining game files legally through your own dumps.

Further Reading & Resources:

  • NSZ Editor GitHub Repository: (Official tool for compression)
  • nxdumptool Guide: How to dump your own Switch cartridges to XCI
  • Yuzu Quickstart Guide: Setting up keys and firmware for emulation

Have you successfully converted your Super Mario Odyssey XCI to NSZ? Share your compression results and load time experiences in the emulation forums.

Technical Analysis of Super Mario Odyssey File Formats: XCI vs. NSZ 1. Introduction Super Mario Odyssey

, released in 2017, is a critically acclaimed 3D platformer that pushes the hardware capabilities of the Nintendo Switch. In the context of game preservation, emulation, and homebrew, the game's data is typically stored and distributed in specific container formats known as XCI and NSZ. These formats determine how the game is read by emulators like Ryujinx or installed on modified hardware. 2. Format Definitions and Origins

Super Mario Odyssey , selecting between file formats like depends primarily on whether you are prioritizing storage efficiency or emulation stability. Feature Comparison (Cartridge Image) (Digital Package) (Compressed NSP) Primary Use Emulators and Flash Carts (like MIG Switch Digital console installs Extreme storage saving Larger (includes "padding" to match physical card size) Moderate (only necessary game data) Smallest (lossless compression) Generally more stable on emulators like Eden Emulator Standard; requires manual update installation Must be decompressed before use on some emulators Can be "all-in-one" files with updates baked in Updates and DLC must be installed separately to the NAND Same as NSP; requires separate update files Key Considerations for Super Mario Odyssey

The terms XCI and NSZ refer to specific file formats used for Nintendo Switch games, typically in the context of custom firmware (CFW) or emulation. Super Mario Odyssey is a highly popular title for these formats due to its performance and expansive content. File Format Differences

XCI (Switch Cartridge Image): This is a direct dump of a physical game cartridge. It is often larger in size than other formats because it includes "padding" to match the physical cartridge size.

NSZ (Compressed Nintendo Switch Download): This is a compressed version of an NSP (Nintendo Switch Package) file. It uses zstandard compression to significantly reduce file size without losing game data, making it ideal for saving storage space. Super Mario Odyssey Game Overview

Super Mario Odyssey is widely considered one of the greatest 3D platformers ever made, featuring a 35-to-62-hour journey for those seeking 100% completion.

Core Mechanics: The gameplay revolves around Cappy, Mario's hat, which allows players to "capture" and control enemies and objects to gain unique abilities.

Performance: The game is optimized to run at a smooth 60 FPS on the original Nintendo Switch hardware, though snapshot mode drops to 30 FPS.

Visuals: Recent updates and patches for newer hardware iterations (often referred to as "Switch 2") allow the game to run at 4K 60FPS with enhanced clarity.

Content & Secrets: The game features over 800 "Power Moons" (secrets) hidden across various themed Kingdoms.

Advanced Techniques: Competitive players use glitches like the Cappy Return Cancel (CRC) in two-player mode to activate flags or triggers from massive distances. Summary Comparison Table Feature XCI Format NSZ Format Origin Physical Cartridge Dump Digital Package (Compressed) File Size Larger (includes padding) Smallest (compressed) Compatibility High (works with most CFW) Requires modern installers (e.g., Tinfoil)

Super Mario Odyssey is a landmark title for the Nintendo Switch that reimagines the "sandbox" style of 3D Mario games first introduced in Super Mario 64. At its core, the game revolves around Mario and his new companion, Cappy, as they travel across various kingdoms on a globe-trotting journey to rescue Princess Peach from Bowser's forced wedding plans. Game Overview and File Formats

When discussing the game in technical or digital contexts, users often encounter specific file extensions like XCI and NSZ. These formats are integral to how Nintendo Switch software is archived and distributed:

XCI: This represents a digital dump of a physical Nintendo Switch cartridge. It contains the game's base data and is typically used for emulation or backup purposes.

NSZ: This is a compressed version of the standard NSP (Nintendo Submission Package) format. Developers and enthusiasts use NSZ to significantly reduce file sizes—often by 40-80%—making it easier to store and transfer. Despite its small size, Super Mario Odyssey is remarkably efficient, originally clocking in at only 5.7 GB. Core Mechanics: Capture and Movement

The defining mechanic of the game is the "Capture" ability. By tossing Cappy at enemies or objects, Mario can take control of them, gaining unique abilities to solve puzzles and navigate the environment. From becoming a massive T-Rex to a high-flying Bullet Bill, this mechanic keeps the gameplay fresh across every kingdom.

Movement is equally critical, especially for the active speedrunning community.

Fastest Movement: Rolling is the most efficient way to traverse smooth surfaces, triggered by pressing X or Y while crouching.

Optimization: Competitive players often play the game in Traditional Chinese because the text displays faster than in English, saving precious seconds during unskippable dialogue. Global Success

Since its release, Super Mario Odyssey has set numerous records, including being one of the fastest Any% completions in history, with top runners finishing the entire game in under 58 minutes. Its blend of nostalgic "2D" segments and expansive 3D worlds continues to make it a must-play title for any Switch owner.

Super Mario Odyssey XCI NSZ: A Comprehensive Guide

Super Mario Odyssey is a 3D platformer developed and published by Nintendo for the Nintendo Switch. Released in 2017, it has received widespread critical acclaim for its innovative gameplay, charming graphics, and catchy soundtrack. For those looking to experience this iconic game, we'll explore the XCI and NSZ file formats, providing you with a helpful guide on what they are and how to utilize them.

Using NSZip (Windows/Linux/macOS):

nsz -d "Super Mario Odyssey [v65536].nsz"

Output: Super Mario Odyssey [v65536].nsp

If the file is already .nsp, skip this step.

Part 2: Why “Super Mario Odyssey XCI NSZ” is a Popular Search

The combination of these terms suggests users are looking for a Super Mario Odyssey file that either:

  1. Starts as an XCI but is converted to NSZ for storage, or
  2. Is shared in NSZ format but sourced from an original XCI dump.

The core appeal is efficiency. A 64 GB SD card can only hold roughly 10 standard XCI files of a game like Odyssey. With NSZ compression, you can fit 14–15 games. For emulator users with large ROM libraries, the difference between 5.6 GB and 3.8 GB per title adds up quickly.

Furthermore, NSZ files support “smart compression”—they compress unused data blocks inside the game, which Super Mario Odyssey has in abundance due to its many isolated kingdom maps.

Reverse (NSZ → XCI):

This is less common, but you can decompress an NSZ back to NSP, then use a tool like 4NXCI to convert that NSP into an XCI. However, emulators like Yuzu and Ryujinx have native NSZ support, so XCI conversion is rarely necessary.

SEO / metadata suggestions

  • Title: “Super Mario Odyssey: Complete Guide, Tips & Best Kingdoms”
  • Meta description (max ~155 chars): “Explore Super Mario Odyssey’s best kingdoms, capture tips with Cappy, and essential strategies to collect Power Moons and beat Bowser.”
  • Suggested keywords: Super Mario Odyssey guide, Cappy tips, Power Moons, best kingdom, Odyssey walkthrough

Part 1: Understanding the Formats – XCI vs. NSP vs. NSZ

Before we focus on Super Mario Odyssey, let’s break down what these acronyms actually mean.

Step-by-Step Conversion (XCI → NSZ):

  1. Extract the XCI: Use hactool or SAK to unpack the XCI into its component parts (the main NCA files and the certificate).
  2. Rebuild as NSP: Convert the loose files into an NSP (uncompressed digital package).
  3. Compress to NSZ: Open the NSP in NSZ Editor. Select compression level (Level 7 is standard; Level 9 is smaller but slower to decompress). Click “Compress to NSZ.”
  4. Result: You now have a Super Mario Odyssey NSZ file that is roughly 30-40% smaller than the original XCI.

Copyright © 2017 - 2026 - All rights reserved Scott Spence

Super Mario Odyssey Xci Nsz May 2026

Super Mario Odyssey: A Modern Classic of Playful Design

Super Mario Odyssey (2017) marks one of Nintendo’s most inventive entries in the long-running Mario franchise. It balances nostalgia and novelty, offering a sandbox-style adventure that both honors series traditions and pushes Mario into fresh creative territory. The game’s design—its movement systems, level structure, and playful mechanics—makes it an instructive example of modern game design that prizes player agency, discovery, and a sense of wonder.

Origins and Design Ambition From its earliest announcements, Odyssey signaled a shift away from linear platforming toward open-ended spaces encouraging exploration. The core ambition was to recapture the thrill of discovery exemplified by Super Mario 64 while integrating decades of Mario’s mechanical refinements. The development team leaned on Miyamoto’s legacy of joyful experimentation: levels as toys rather than tests, systems that invite improvisation, and an aesthetic that signals possibility.

Cappy: A Mechanical and Narrative Pivot The introduction of Cappy, a sentient hat that Mario can throw to possess enemies and objects, functions as Odyssey’s central innovation. Mechanically, Cappy expands Mario’s repertoire beyond jumps and run-based acrobatics into possession-based problem solving. This creates emergent gameplay: combining captures and platforming leads to surprising solutions and momentary delight. Narratively, Cappy provides companionship and motivation—an emotionally light yet effective throughline that contrasts with the series’ often minimal plots.

Kingdoms as Curated Playgrounds Each kingdom in Odyssey acts as a curated play space with its own rules, geometry, and character. Rather than being mere backdrops for levels, the kingdoms are design experiments: the Metro Kingdom’s vertical urbanity shifts emphasis toward traversal and NPC interaction; the Sand Kingdom emphasizes momentum and vertical navigation; the Luncheon Kingdom turns scale and texture into playful obstacles. The consistent presence of Power Moons as collectible goals creates an open-ended reward loop—players pursue dozens of small, satisfying tasks rather than a few long, arduous objectives.

Movement and Mastery Movement in Odyssey is finely tuned. Mario’s control responsiveness, nuanced jump arcs, and the added mobility from cap throws and captures give players a toolbox for expression. The game supports multiple skill levels gracefully: newcomers can enjoy straightforward platforming and story beats, while experienced players can chase sequence breaks, speedrun routes, and tech-rich maneuvers. This layered design—accessible core mechanics with deep emergent mastery—defines a hallmark of great game systems.

Aesthetic Playfulness and World-Building Odyssey’s visual and auditory design reinforce its playful tone. Each kingdom’s theme is established quickly through art direction and soundtrack; the music often combines orchestral weight with jaunty motifs that make exploration feel celebratory. Environmental details and NPC interactions populate the world with small, characterful moments that reward curiosity. The game’s blend of realistic textures (a bustling city, edible landscapes) with surreal twists (giant fish as taxis, living hats) creates a consistent sense of whimsy.

Risk, Reward, and Player Freedom Unlike linear platformers that gate progression behind precise mastery, Odyssey disperses rewards through diverse tasks: environmental puzzles, platforming challenges, hidden secrets, and performance-based objectives. This diversification reduces the penalty of failure, encouraging experimentation. Players can approach objectives in multiple ways—stealth, capture, platforming, or environmental manipulation—which reinforces the game’s core message: play how you want.

Cultural Impact and Legacy Odyssey revitalized critical and commercial appreciation for Mario in the late 2010s. Its open-ended kingdoms and the Cappy mechanic influenced subsequent design conversations around player agency in AAA platformers. Moreover, Odyssey demonstrated that mainstream console titles could be at once broadly accessible and mechanically deep—a blueprint for balancing approachability with emergent gameplay.

Conclusion Super Mario Odyssey stands out because it treats its player as an explorer and a creative agent. Its charm comes not just from polished controls and beautiful presentation but from a design philosophy that privileges playful possibility. In a landscape increasingly focused on systems and progression loops, Odyssey is a reminder that the simplest goal—making play feel delightful—remains one of the most powerful design ambitions in games.

Final Verdict: Which Format Should You Actually Use?

Here is the TL;DR for anyone overwhelmed by the options.

  • For PC Emulation: Download or convert to NSZ. The space savings are worth the marginal decompression overhead.
  • For Modded Switch (Atmosphere): Use NSZ for installation. Keep a copy of the XCI for archival purposes if you want a 1:1 cartridge backup.
  • For SX OS (Legacy): Stick with XCI. SX OS has buggy NSZ support.
  • For Sharing with Friends (Legal backups only): Use NSZ – smaller file size means easier transfers.

Super Mario Odyssey remains a masterpiece of 3D platforming. Using modern file formats like NSZ ensures that whether you are replaying the Cascade Kingdom on a Steam Deck via Yuzu or exploring the Moon Kingdom on your modded Switch, the experience is smooth, fast, and storage-efficient. Just remember to respect the developers who crafted this adventure by obtaining game files legally through your own dumps. super mario odyssey xci nsz

Further Reading & Resources:

  • NSZ Editor GitHub Repository: (Official tool for compression)
  • nxdumptool Guide: How to dump your own Switch cartridges to XCI
  • Yuzu Quickstart Guide: Setting up keys and firmware for emulation

Have you successfully converted your Super Mario Odyssey XCI to NSZ? Share your compression results and load time experiences in the emulation forums.

Technical Analysis of Super Mario Odyssey File Formats: XCI vs. NSZ 1. Introduction Super Mario Odyssey

, released in 2017, is a critically acclaimed 3D platformer that pushes the hardware capabilities of the Nintendo Switch. In the context of game preservation, emulation, and homebrew, the game's data is typically stored and distributed in specific container formats known as XCI and NSZ. These formats determine how the game is read by emulators like Ryujinx or installed on modified hardware. 2. Format Definitions and Origins

Super Mario Odyssey , selecting between file formats like depends primarily on whether you are prioritizing storage efficiency or emulation stability. Feature Comparison (Cartridge Image) (Digital Package) (Compressed NSP) Primary Use Emulators and Flash Carts (like MIG Switch Digital console installs Extreme storage saving Larger (includes "padding" to match physical card size) Moderate (only necessary game data) Smallest (lossless compression) Generally more stable on emulators like Eden Emulator Standard; requires manual update installation Must be decompressed before use on some emulators Can be "all-in-one" files with updates baked in Updates and DLC must be installed separately to the NAND Same as NSP; requires separate update files Key Considerations for Super Mario Odyssey

The terms XCI and NSZ refer to specific file formats used for Nintendo Switch games, typically in the context of custom firmware (CFW) or emulation. Super Mario Odyssey is a highly popular title for these formats due to its performance and expansive content. File Format Differences

XCI (Switch Cartridge Image): This is a direct dump of a physical game cartridge. It is often larger in size than other formats because it includes "padding" to match the physical cartridge size.

NSZ (Compressed Nintendo Switch Download): This is a compressed version of an NSP (Nintendo Switch Package) file. It uses zstandard compression to significantly reduce file size without losing game data, making it ideal for saving storage space. Super Mario Odyssey Game Overview

Super Mario Odyssey is widely considered one of the greatest 3D platformers ever made, featuring a 35-to-62-hour journey for those seeking 100% completion.

Core Mechanics: The gameplay revolves around Cappy, Mario's hat, which allows players to "capture" and control enemies and objects to gain unique abilities. Super Mario Odyssey: A Modern Classic of Playful

Performance: The game is optimized to run at a smooth 60 FPS on the original Nintendo Switch hardware, though snapshot mode drops to 30 FPS.

Visuals: Recent updates and patches for newer hardware iterations (often referred to as "Switch 2") allow the game to run at 4K 60FPS with enhanced clarity.

Content & Secrets: The game features over 800 "Power Moons" (secrets) hidden across various themed Kingdoms.

Advanced Techniques: Competitive players use glitches like the Cappy Return Cancel (CRC) in two-player mode to activate flags or triggers from massive distances. Summary Comparison Table Feature XCI Format NSZ Format Origin Physical Cartridge Dump Digital Package (Compressed) File Size Larger (includes padding) Smallest (compressed) Compatibility High (works with most CFW) Requires modern installers (e.g., Tinfoil)

Super Mario Odyssey is a landmark title for the Nintendo Switch that reimagines the "sandbox" style of 3D Mario games first introduced in Super Mario 64. At its core, the game revolves around Mario and his new companion, Cappy, as they travel across various kingdoms on a globe-trotting journey to rescue Princess Peach from Bowser's forced wedding plans. Game Overview and File Formats

When discussing the game in technical or digital contexts, users often encounter specific file extensions like XCI and NSZ. These formats are integral to how Nintendo Switch software is archived and distributed:

XCI: This represents a digital dump of a physical Nintendo Switch cartridge. It contains the game's base data and is typically used for emulation or backup purposes.

NSZ: This is a compressed version of the standard NSP (Nintendo Submission Package) format. Developers and enthusiasts use NSZ to significantly reduce file sizes—often by 40-80%—making it easier to store and transfer. Despite its small size, Super Mario Odyssey is remarkably efficient, originally clocking in at only 5.7 GB. Core Mechanics: Capture and Movement

The defining mechanic of the game is the "Capture" ability. By tossing Cappy at enemies or objects, Mario can take control of them, gaining unique abilities to solve puzzles and navigate the environment. From becoming a massive T-Rex to a high-flying Bullet Bill, this mechanic keeps the gameplay fresh across every kingdom.

Movement is equally critical, especially for the active speedrunning community. Final Verdict: Which Format Should You Actually Use

Fastest Movement: Rolling is the most efficient way to traverse smooth surfaces, triggered by pressing X or Y while crouching.

Optimization: Competitive players often play the game in Traditional Chinese because the text displays faster than in English, saving precious seconds during unskippable dialogue. Global Success

Since its release, Super Mario Odyssey has set numerous records, including being one of the fastest Any% completions in history, with top runners finishing the entire game in under 58 minutes. Its blend of nostalgic "2D" segments and expansive 3D worlds continues to make it a must-play title for any Switch owner.

Super Mario Odyssey XCI NSZ: A Comprehensive Guide

Super Mario Odyssey is a 3D platformer developed and published by Nintendo for the Nintendo Switch. Released in 2017, it has received widespread critical acclaim for its innovative gameplay, charming graphics, and catchy soundtrack. For those looking to experience this iconic game, we'll explore the XCI and NSZ file formats, providing you with a helpful guide on what they are and how to utilize them.

Using NSZip (Windows/Linux/macOS):

nsz -d "Super Mario Odyssey [v65536].nsz"

Output: Super Mario Odyssey [v65536].nsp

If the file is already .nsp, skip this step.

Part 2: Why “Super Mario Odyssey XCI NSZ” is a Popular Search

The combination of these terms suggests users are looking for a Super Mario Odyssey file that either:

  1. Starts as an XCI but is converted to NSZ for storage, or
  2. Is shared in NSZ format but sourced from an original XCI dump.

The core appeal is efficiency. A 64 GB SD card can only hold roughly 10 standard XCI files of a game like Odyssey. With NSZ compression, you can fit 14–15 games. For emulator users with large ROM libraries, the difference between 5.6 GB and 3.8 GB per title adds up quickly.

Furthermore, NSZ files support “smart compression”—they compress unused data blocks inside the game, which Super Mario Odyssey has in abundance due to its many isolated kingdom maps.

Reverse (NSZ → XCI):

This is less common, but you can decompress an NSZ back to NSP, then use a tool like 4NXCI to convert that NSP into an XCI. However, emulators like Yuzu and Ryujinx have native NSZ support, so XCI conversion is rarely necessary.

SEO / metadata suggestions

  • Title: “Super Mario Odyssey: Complete Guide, Tips & Best Kingdoms”
  • Meta description (max ~155 chars): “Explore Super Mario Odyssey’s best kingdoms, capture tips with Cappy, and essential strategies to collect Power Moons and beat Bowser.”
  • Suggested keywords: Super Mario Odyssey guide, Cappy tips, Power Moons, best kingdom, Odyssey walkthrough

Part 1: Understanding the Formats – XCI vs. NSP vs. NSZ

Before we focus on Super Mario Odyssey, let’s break down what these acronyms actually mean.

Step-by-Step Conversion (XCI → NSZ):

  1. Extract the XCI: Use hactool or SAK to unpack the XCI into its component parts (the main NCA files and the certificate).
  2. Rebuild as NSP: Convert the loose files into an NSP (uncompressed digital package).
  3. Compress to NSZ: Open the NSP in NSZ Editor. Select compression level (Level 7 is standard; Level 9 is smaller but slower to decompress). Click “Compress to NSZ.”
  4. Result: You now have a Super Mario Odyssey NSZ file that is roughly 30-40% smaller than the original XCI.