Xye is a puzzle game in which you have to get all the gems. The levels vary in difficulty and solving methods. It can also open and play sokoban files (.xsb)
When I got to portableApps.com today I really liked the way these things work, I was using U3 for a while but it didn't let me just add apps that are already portable and it also hides the folders and stuff.
I figured that I had to contribute with something and also Xye was in the portable philosophy for some time, It doesn't modiffy stuff outside its folder or touches the registry.
I had to tweak some stuff though so I need beta testers.
More info: http://xye.sourceforge.net/wxye.php
Download of portable version: From sourceforge