Rhythm Heaven Classic
The Matrix has 46 music & rhythm games on file for the Nintendo DS, released between 2004–2010. 26 of them support multiplayer, including 2 with co-op. They're ranked below by legacy score, so the games that shaped the genre on the DS come first, with lesser-known picks further down.
Music and rhythm games challenge your timing by asking you to hit inputs in sync with the beat.
Typical commitment: quick session (under an hour, or endless arcade fun). Tip: Modern TVs can add input lag that throws off timing; use your TV's game mode if rhythm feels off.