Tetris 99 has been a fairly popular game for Nintendo Switch Online users, but if you're more of an offline player, you'll still be able to get in on the fun as well, through the game's newly revealed Big Block Season Pass. This will allow for offline matches against the CPU, pitting you against 98 bots in the "CPU Battle Mode", or will let you play a "Marathon" mode to see how long you can last. A third offline mode is included, but won't be released until later this year. While Tetris 99's online mode can be played for free, assuming you have Nintendo Switch Online, you can grab the offline Big Block DLC for $9.99.
Another Grand Prix event will also be held in the game on May 17th, where you earn event points. Obtain 100 of them, and you'll unlock a Game Boy skin, which makes the game look like it once did on the classic handheld.