Tetris 99 adds Yoshi and the Mysterious Book crossover theme

Nintendo is using Tetris 99 to keep one of its older online staples in circulation while Yoshi and the Mysterious Book gets its own spotlight on Nintendo Switch 2. The 54th MAXIMUS CUP will run from May 29 at 12:00 a.m. PT through June 1 at 11:59 p.m. PT, and players who collect 100 event points in Tetris 99 mode will unlock an in-game collaborative theme tied to Yoshi’s newest adventure. Participation requires a Nintendo Switch Online membership and a Nintendo Account.

The reward is more than a cosmetic badge. Nintendo says the theme will bring in art, music and Tetrimino designs inspired by Yoshi and the Mysterious Book, extending the game’s identity into the battle royale long after the launch window closes. That matters because the Yoshi title itself arrived on May 21 for Nintendo Switch 2 and is priced at $59.99 digitally on the official store, where Nintendo describes it as an adventure built around Yoshi and a talking book named Mr. E.

The structure is familiar. Nintendo used the 53rd MAXIMUS CUP earlier in 2026 to push Tomodachi Life: Living the Dream, giving Tetris 99 players another limited-time theme for 100 event points over a May 1 to May 4 window. Nintendo’s news feed has also cycled through other short-lived Yoshi tie-ins, including limited-time icon elements on May 20, reinforcing the same pattern of recurring incentives that pull players back into the app between larger releases.

That cadence turns Tetris 99 into more than a single game. It becomes a retention engine for Nintendo’s wider first-party lineup, a place where nostalgia, character branding and time-limited rewards work together to keep attention moving from one release to the next. For a free Switch title that depends on online membership and repeat play, each crossover does double duty: it gives current players a reason to return, and it keeps a newly launched franchise visible in the days after release.