xQuadrature for PALM
Quadrature is a new two player strategy game made by Mark Steere. There are two ways to win in Quadrature: kill enough enemy checkers "squaring" them or get three of your stones onto the enemy "home plate". To "square" an enemy checker, you move to form a rectangle on the board with three of... Quadrature won the American MENSA award.
http://www.setupgroup.com/palm/quadrature.zip - 60Kb - Download - Screenshot

Quadrature
Infiltrate your opponent's camp and capture the three colored squares on the field behind him. But be careful: your opponent can take over your pieces just by boxing them in, and suddenly his army is larger than yours. Oh, did I mention that your pieces can't retreat?
http://www.randomly.com/pub/quadrature.exe - 4Mb - Download - Screenshot