Iin is a compact multiplayer adventure, platformer, and puzzle hybrid from Epopeia Games that landed on the Nintendo Switch eShop on April 6, 2023. It ships as an NSP file under Title ID 01005A5017C36000 and weighs in at just 318 MB, so it fits comfortably on a Switch microSD card without forcing you to shuffle your library around. The premise is simple and immediately readable: work through 80 hand-built challenges, either solo or with a second player in local co-op, and post your best times and scores to a global ranking board. If you like your platformers with a puzzle twist and a leaderboard that gives you a reason to replay a stage one more time, Iin is built for exactly that loop.

This page refreshes the original listing with the details you actually need before you download: confirmed file specs, the real download mirrors, gameplay notes drawn from the official eShop description, and a clear-eyed look at what the game does well and where it asks for patience. You can grab the base game NSP below and be in the first challenge within minutes.

Technical Specifications

The version number above is an estimate based on the eShop release build, not a confirmed patch level. Epopeia Games published the title as a single eShop release, and the listing you see here reflects that base game. If a post-launch update appears, the NSP you download from the mirrors below will still install cleanly, and you can layer any future update file on top of it.

What Iin Actually Plays Like

Strip away the genre tags and Iin is a challenge-runner. Each of the 80 stages hands you a compact layout and a goal, then gets out of your way. You move, you jump, you time your inputs, and you solve whatever puzzle logic the stage layers on top of the platforming. The puzzles are not there to slow you down for their own sake; they exist to make the movement interesting. A stage might ask you to route through a sequence of switches, or to line up a jump that only works if you have already solved the room's layout. Clear it, and the game logs your performance.

That logging is the heart of the design. Every level feeds a global ranking, so your clear time or score is measured against everyone else who has run the same stage. It is a light competitive layer, but it changes how you approach the game. You stop treating a stage as something to finish and start treating it as something to optimize. The 80 challenges give you a long runway for that mindset, and because each one is short, you can pick up the game for five minutes and still make progress.

Local Co-op Changes the Equation

You can play Iin solo, but the two-player local co-op mode is where the game gets its personality. Two players on one Switch means coordination becomes part of the puzzle. Stages that feel straightforward alone become communication exercises with a second person in the mix. You will find yourself calling out timing, dividing responsibilities, and laughing when a run falls apart because one of you jumped a beat early. Local co-op also makes the game a genuine couch option when you have someone else in the room and want something that is easy to start and hard to put down.

If you enjoy tightly designed challenge platformers and want more of that style on Switch, the Rhythm Heaven Groove Switch XCI release is a natural companion pick for your library, and players who lean toward cooperative sandbox play tend to pair this kind of title with the Minecraft Switch NSP Update DLC eShop package.

Key Features

• 80 handcrafted challenges spread across platforming and puzzle logic, giving you a substantial single-player campaign to work through at your own pace.
• Single-player or two-player local co-op on one console, so you can tackle every stage alone or bring a friend into the same room.
• Global ranking per level that records your performance on each challenge and compares it against players worldwide.
• Special Challenge events every 15 days that drop a fresh bundle of challenges, giving returning players a reason to come back and a new leaderboard to climb.
• Eleven supported languages — Japanese, English, Spanish, French, Portuguese, German, Italian, Dutch, Russian, Korean, and Chinese — so the interface and text work for a wide international audience.
• Compact 318 MB install that leaves plenty of room on your microSD card for the rest of your library.
• Short, replayable stage design that suits quick sessions and long optimization runs equally well.

Pros & Cons

Pros

• The 80-stage structure gives you a clear sense of progress without padding the runtime with filler.
• Local co-op is genuinely fun and turns stages into coordination puzzles rather than solo execution tests.
• Per-level global rankings add replay value that most small eShop titles never bother with.
• The rotating Special Challenge every 15 days keeps the game from going stale after you clear the main set.
• At 318 MB, the download is fast and the install is painless.
• Broad language support makes it accessible to a wide range of players.

Cons

• The competitive layer is score-based, so players who do not care about leaderboards lose a chunk of the long-term hook.
• Local co-op requires a second person physically present; there is no online multiplayer option described for the title.
• As a small eShop release, the presentation is functional rather than lavish, and the scope is deliberately compact.
• Challenge-style design means difficulty spikes are part of the package — some stages will take repeated attempts before they click.

Who Should Download Iin

Iin fits a specific player. You will get the most out of it if you like short, replayable stages, if you enjoy shaving seconds off a clear time, and if you have someone to hand a second controller to. It is also a good pick for players who want a puzzle-platformer that does not demand a 30-hour commitment. If you prefer narrative-driven adventures with long cutscenes or online matchmaking, this is not that game, and the listing should not pretend otherwise.

The 80-challenge structure means the game respects your time in both directions: you can play for ten minutes and finish a stage, or you can sit down for an evening and push through a dozen. The global ranking gives the completionist crowd something to chase after the credits-equivalent moment, and the 15-day Special Challenge cycle gives lapsed players a reason to check back in.

Version Freshness and Publisher Details

Epopeia Games published Iin on the Nintendo Switch eShop on April 6, 2023. The listing here reflects the base eShop release, and the version number is marked as an estimate because the input does not confirm a specific patch level beyond the initial build. What that means for you in practice is straightforward: the NSP you download is the release build, it installs as a standard Switch title, and if Epopeia ships an update later, you can apply it on top without reinstalling the base game.

The Title ID 01005A5017C36000 is the identifier you can use to confirm you have the correct file and to match any future update or DLC content to this specific release. Keep that ID handy if you maintain a large NSP library, because it is the fastest way to avoid mixing up similarly named titles.

Installation Guidance

Installing an NSP on Switch is a well-worn process, and Iin does not add any unusual steps. Transfer the NSP to your console's microSD card or install it over USB from your PC using your preferred NSP installation tool. Because the file is only 318 MB, the transfer finishes quickly even on slower cards. Once installed, the game appears on your home screen like any other eShop title, and you can launch it directly.

If you are installing on a PC or mobile device for use with an emulator, the same NSP file works — the operating system field for this listing covers Windows, Android, and iOS, which reflects the emulator-friendly nature of the format rather than a native port. On Android and iOS, you will need a Switch emulator front end that supports NSP files; on Windows, the same applies. The game itself is the Switch build, so performance depends on your emulator and hardware rather than on anything in the NSP.

For players building out a Switch library around cooperative and rhythm-adjacent titles, the Groove Coaster Future Performers Switch NSP Update eShop release is another compact pick that pairs well with Iin's short-session structure.

Download Links

The base game NSP is 318 MB and is available from the mirrors below. If a link is broken or missing, report it in the comment section and it will be addressed.

Base Game NSP (318 MB)

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Please report any broken, dead, or missing links in the comment section.

Final Word on Iin

Iin is a focused, small-footprint challenge platformer that knows exactly what it wants to be: 80 stages, local co-op, global rankings, and a rotating event schedule that keeps the leaderboard alive. At 318 MB, the cost of trying it is measured in minutes, not hours. If you have been looking for a couch co-op puzzle-platformer with a competitive edge, this is a sensible addition to your Switch library.

Frequently Asked Questions & Setup Guide