Incredipede is a puzzle game that celebrates the vast diversity of life in the world. Follow Quozzle, a lone Incredipede with the unique ability to grow new arms and legs wherever she needs them. Transform into a snake, a spider, a horse, a monkey - anything you can imagine.
Contraption Maker is the spiritual successor to the classic machine-building puzzle game, The Incredible Machine. It follows the same concept where you create intricate machines to solve a bewildering array of puzzles.
The Butterfly Effect is a free and open source game that uses realistic physics simulations to combine lots of simple mechanical elements to achieve a simple goal in the most complex way possible. The Butterfly Effect has been over five years in the making.