The game I spent my most time is
Harvest Moon: Sunshine Island..That's game suck me a lot..The story line is interesting and there's lot fun thing inside.
And
Kingdom Hearts 358/2 Days managed to suck me too.I dun really play RPG but this game is the only one RPG that suck me.. So it is quite success too..
And another make me "SNAP!" is
Big Bang Mini,the game's graphic,gameplay,control was awesome.The game was cool and very attractive too.Another cool game I think is
Rhythm Heaven.The game got a lot creative stage that I never think about it..The gameplay was cool..Can give it a try but cheat is recommended as you have various stage to play.
Sideswiped probably the best driving game I play...It is LOT better than Need For Speed DS series.. Worth to give it a try..
And as honorable mentions:
Scribblenauts(Very creative and epic but it dun suck me..)
Pokemon Heart Gold and Soul Silver( I am not a Pokemon Fans so I haven play it
Mario and Luigi: Bowser's Inside Story (Will play it soon)
Grand Thief Auto:China Town War(I dun play it..Not suitable for my age
)
Legend of Zelda :Spirit Track(Looks great but I dun weak in puzzle)