Pokemon Diamond remided just how good Nintendo is at making simple yet addictive games.
The last Pokemon I played was red, which was over 9 years ago. Needless to say, Diamond is probably the best one yet.
Also can't go wrong with New Super Mario Bros and of course Mario Kart.
If you're looking for something a little different, Phoenix Wright, Trauma Centre and Hotel Dusk are awsome Japanese style games.
But again you owe it to yourself to rekindle some Pokemon love. For nothing else than the awsome gameplay.