BRICK[bricksmash]SMASH is a bunch of tiny Breakout clones within a Breakout clone: each time your ball hits a brick, it spawns a tiny ball inside the brick it hits. Once each brick runs out of tiny bricks, it disappears and the balls inside the brick are set free. Don't try this with real bricks or you'll end up warping reality. (Try it on the computer instead, and you make a rainbow!)
Interactive art has a reputation for being light on the challenge, but These Robotic Hearts of Mine, a puzzle game by Alan Hazelden definitely shows that it doesn't have to be. It's a simple game of gears and direction... one that I would love to see re-created in the physical space of a gallery. However, each solution presents another line in a story of technology, hearts and heartbreak. The puzzles alone would be fine, and the elegy is affecting. However, the combination fits like one hand into another.