Mystic Mine takes simple mechanics and turns them into an amazingly fun and unique experience. Experience over 200 levels of single player gaming or play with up to six players on the same keyboard! If you are looking for a game that gives you pure, carefree fun, then this is it!
Professor Fizziwizzle and the Molten Mystery is a standalone expansion to it's precedent Professor Fizziwizzle. It is a puzzle-platformer which offers even more gadgets and enemies to interact with than it's prequel. Also includes a level-editor!
World of Goo is a physics-based puzzle game based on a seven day experimental game called Tower of Goo. The basic idea is to build structures using balls of goo. The goal of each level is to get enough of the balls of goo to a specified exit. The game has five chapters with several levels each, the game follows a storyline involving the mysterious World of Goo corporation.
Penumbra: Overture is a first person horror-adventure-puzzle type game which focuses on story, and immersion, and lots of puzzles. The game has a very advanced physics system which allows a never before seen environment interaction. The player can open drawers, pull levers, pick up objects and more using natural mouse movements.