2D: NSMB U (Most up-to-date mechanics and decent co-op) 3D: SM3DW (Like a NSMB game, but in 3D and with better co-op) or Galaxy 2 (game content besides replaying the game as Luigi). Party: Mario Party 6 & 7 Kart Double Dash & 8 RPG: Bowser's Inside Story Paper: Thousand Year Door Sports: Strikers Charged and Tennis Power Tour (basically a GBA version of Power Tennis, but with OCs and Story Mode)