Sgt Isaac
Smash Cadet
I recently bought this on XBLA. Its a puzzle/platformer and does that extremely well. At first I thought it was merely a homage to Super Mario Bros., but eventually realized it was so much more. By the end level I'm using Einsteins theories of Time Dilation in order to collect pieces of the periodic table of elements in order to unlock a princess made of pure energy. (lol atombomb) The plot is great and the puzzles are top-notch, even more complex than some of Portal's "advanced" levels.
