I love:

My DS lite and Scribblenauts game. This game is so addictive that yes, I had to hide it from myself. After being trapped in the house for 4 days (thanks blizzards of 2010) I decided I could break my hiatus. The best part of this game is that it uses your creativity to solve the puzzles. Need to get to the top of a mountian? Write the word "jet pack" or "Sherpa" and see what happens. You can time travel, create dinos, zombies, glue things together--you name it, you can probably do it. Scribblenauts is a great, silly change of pace from Brain Age and sudoku.