Nintendo announced a Monster Hunter Rise and Tetris 99 collaboration event, beginning on October 8, 2021 and lasting until October 12, 2021. The event is exclusive to Tetris 99 but feature music from Monster Hunter Rise. The Tetris blocks have also been changed slightly to feature symbols from the Monster Hunter series. Music that will play during the event include the Monster Hunter theme medley from Monster Hunter Rise and the Magnamalo theme. [Thanks, Famitsu!]
Players can obtain the event theme by collecting 100 event points during the duration of the collaboration. Event points will be distributed to players based on their rankings during individual matches. This means that players can simply grind out event points during this period to obtain the theme.
Tetris 99 has featured several collaboration events in the past. This includes a Tetris 99 and The Legend of Zelda: Skyward Sword collaboration event. Players could obtain a unique Skyloft theme in Tetris 99 through the event. Like the Monster Hunter Rise collaboration, the theme features unique music. Players could receive this theme through event participation, but only for a limited time.
Tetris 99 is immediately available for Nintendo Switch. Monster Hunter Rise is available for Nintendo Switch, with a PC version set to release on January 12, 2021.