Tetris DS was my most played DS game, could this do the same for me 3DS-wise? Probably.
Same here.
Tetris is still a system seller.
Most of these features have been in 'Tetris Party Deluxe' already. But this game was based on a Wii game and looked realy ugly and stupid on DS, although the game mechanics where really good.
Anyway, it's more fun to buy a new handheld with a new Ttris than to buy a new Tetris for an old handheld.