Pushmo

Pushmo (引ク押ス - Hiku Osu; Pullblox in EU territories) has 250 puzzles to solve and involves pushing and pulling blocks in order to rescue a child stuck on top of them.

When you are done with the levels included in the game, you can create your own levels and share them with the community through QR-codes. Some of the levels are designed around sprites from popular NES games.