I have tetris too, excellent game, you guys with DS should also be checking out animal crossing, its ace.
What exactly is animal crossing, though? i thought about getting it but it seems a bit vague...
Ive had it ages and I still dont know, its just bonkers and weird but once youre into it, it will happily eat up 30 mins / 1hr a day!
Its classed as virtual life I suppose thats about right, its not a game you can sit at for a monster 24 hour session and complete, it doesnt work like that, the game runs in real time.
But it is good, it looks a bit kiddie but if thats not your bag just give all the animals extremely offensive greetings, spices things up no end