The Tetris 99 35th Maximus Cup - Aionios Edition event runs from 12 a.m. PT on September 29 to 11:59 p.m. PT on October 2, 2023. Players must be a Nintendo Switch Online member to participate in the event. Earn 100 event points to unlock a new theme featuring art, music, and Tetrimino designs. Check out the latest Tetris 99 trailer to see what to expect.