Brown Dyed Hotel
Brown Dyed Hotel is by a group of talented Swedish students from Campus Karlshamn of Blekinge Institute of Technology who have been busy building a few games lately. The first one that caught my eye is a collection of puzzles that is one part discovery, similar to no circles, and one part riddle game, as with not pron, and it will surely give your gray matter a workout.
Work your way through each level discovering the secrets that allow you to complete each task. If you get stuck, don't be afraid to reload the browser page to reset the current puzzle, if necessary. Since each puzzle is slightly different than the one before it, the experience feels fresh and unique, if a bit short. There are only about 12 levels from what I could see. Some notes on the site hint at more, though.
The entire site is full of mystery and secrets, so when you're done with the puzzle make sure you check out the other goings on at Brown Dyed Hotel. And for the more adventurous, look for their beautiful 3D physics game, Ether, which is actually a Half-Life 2 mod with a gorgeous stylized environment.
Cheers to Aini for the link! =)
Update: The game is no longer available to play on the internet. Previously tagged as: browser, discovery, flash, free, game, linux, mac, puzzle, rating-g, riddle, simpleidea, windows