The castle has always been there, or so it seems. Countless warriors have gone in to take it on, and none have come back. Phase Co.’s KAREI puts the player in the role of a kunoichi climbing the Infinite Castle with scrolls, shuriken, and stealth, and the developer’s one-line pitch captures the mood: there’s no way back, only the next move.
Every Turn Is a Puzzle
The game is played on an 8×8 grid. When the player moves, the enemies move too, so one careless step can end a run. Each turn means deciding whether to attack, evade, or set a trap, and the developer says each floor is designed as its own self-contained tactical puzzle.
The kunoichi has three ninja tools. Scrolls set traps that break up an enemy formation, shuriken control distance, and stealth erases your presence. “Secret tools” picked up during a run act as wildcard variables that can swing a fight. What you pick up and when you use it decides survival, according to the developer.
What’s in the Castle
Per the Steam page, faintly glowing walls hide items, while ominous-looking walls hide weapons and cursed talismans. Oni-type enemies guarding the passages each need a different movement path and a different weapon to answer. Beyond standard floors, “karakuri” (mechanism) floors appear in which the floor itself turns hostile. Floors are generated each time anew, and progress doesn’t carry over between runs.
Dark, Atmospheric 2D
Steam tags include 2D, Dark, and Atmospheric. The world is built from a traditional Japanese castle, ninja, and oni, set inside a grid-based tactical puzzle. Details on sound and music haven’t been released.
AI Disclosure
The Steam page’s AI disclosure states that generative AI tools were used in producing some of the 2D art assets, with the developer reviewing and editing the results before they went into the game. AI translation tools were also used for part of the in-game text localization, with the developer checking the translations. This continues the pattern this coverage has tracked all year of small teams disclosing limited AI use on their store pages.
The Demo, Platform by Platform
The demo covers floors 1 through 10 and includes the first boss fight against Gashadokuro. Steam (Windows) and Android offer a free demo through their stores. On iOS the demo ships as “KAREI Prologue” on the App Store and is currently open for pre-order. A demo-exclusive online ranking season, “Dawn Echoes,” opens alongside it.
KAREI was shown in a playable version at Tokyo Game Show 2026, held September 17–21 at Makuhari Messe, and the full version targets a Steam release in Q4 2026. No Steam user reviews exist yet as of October 6.
Who This Is For
Strong fit for: tactics and puzzle fans who like games where every move is a deliberate read of the opponent’s reply; roguelike players who prefer short, high-stakes runs over long builds; players drawn to Japanese castle, ninja, and oni settings; mobile players, since the demo reaches iOS and Android on day one.
Cautious fit for: players who need Korean language support (not available); anyone who wants details on sound and music before trying it.
Less ideal for: players who dislike turn-based pacing or procedurally generated floors with no persistent progress between runs.
The Takeaway
KAREI takes the roguelike premise of climbing an impossible tower and compresses it onto an 8×8 board where the enemy moves whenever you do. A free demo on three platforms, ten floors, and a first boss give players a clear look before the Next Fest window and a Q4 full release.
The castle has no way back. The board is eight by eight. And the enemy’s next move depends on yours.
Free demo: October 10, 2026 on Steam, iOS (“KAREI Prologue,” pre-order open), and Android.
Information regarding ‘KAREI – ENDLESS DEATH MATCH’
| item | detail |
|---|---|
| Game name | KAREI – ENDLESS DEATH MATCH (華麗 無限城の死闘) |
| Development and distribution | Phase Co., Ltd. (Tokyo, Japan) |
| Genre | Turn-based puzzle roguelike |
| platform | Steam (Windows) / iOS / Android |
| Player count | 1 person |
| Trial version release date | October 10, 2026 (Simultaneous on 3 platforms, Free) |
| Trial version range | Floors 1 through 10, up to the first boss, ‘Gashadokuro’. |
| Official release | Scheduled for Q4 2026 (Steam) |
| Supported languages | Japanese, English (Korean not supported) |
| Reactions/Evaluations | No Steam user reviews (as of October 6, 2026) |
| Steam Page | Shortcut |
