I recommend Amplitude - it's a music game, and it's one of the things we've played most on our PS2 :) It does have an assortment of multiplayer modes too.
Yeah, I'd second that - it's by far the best push-the-buttons-in-time-to-the-music game we have.
Along that theme is also Gitaroo Man, although we got stuck somewhere and lost interest somewhat. SSX and its sequels are also good non-violent games - snowboard racing & tricks. Bust-A-Move or a sequel are puzzle games, shoot bubbles at the ceiling, three of a colour together burst, if the screen fills up with bubbles it's game over.
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Along that theme is also Gitaroo Man, although we got stuck somewhere and lost interest somewhat. SSX and its sequels are also good non-violent games - snowboard racing & tricks. Bust-A-Move or a sequel are puzzle games, shoot bubbles at the ceiling, three of a colour together burst, if the screen fills up with bubbles it's game over.