Super Serif Bros.
In what may at first appear as a bunch of strange characters littered across the screen, Super Serif Bros. is actually an intricate and well-designed puzzle game with similarities to classics Rogue and Lode Runner.
The objective is fairly simple: using the arrow keys for movement, navigate the player character (I) through each level to collect all of the gold (£) and then make it to the exit (E) safely. Along the way you will find a multitude of characters with special behaviors, such as elevators ("), conveyor belts (()), moving platforms (T), activation switches (~), and the like. There is even an occasional enemy thrown in that will give you chase, or fall on you.
With 19 levels to play, and probably more on the way, Super Serif Bros. will turn you inside out by the time you make it through and beat the game. That is, if you can beat the game. The game starts off easy with several training levels, and then ramps up to some that are down right devilishly difficult.
And when you're done with the levels that Rob has concocted, there is even a level editor with which to create your own(!) Although there is presently no way to add your own designs to the SSB game page (UPDATE: Now there is!), since the levels are pure text you can post them here as comments if you like. Then just copy, paste into the game's editor, and voila!
Cheers to Yuval for suggesting the game. =)
Update: I have had so much fun with this great new puzzle game that I threw together a GUI level editor for the game in Flash that should help make the level editing task a bit less tedious. I handed it off to Rob Allen who made some improvements to it himself. While Rob is working on a repository for level uploads to his site, I have added a feature to the editor that allows you to upload your levels directly as a comment posted here on the SSB review page. Check the walkthrough section for details, or jump right in and create a level.
Update #2: The SSB Level Pit is now open for business!