Relaxing ball game that relies more on puzzle solving than reflexes.
http://www.puzzledimension.com/
The game will initially run at a full-screen 1280x720. If your monitor does not support this resolution, hit Alt+Enter to toggle windowed mode, then adjust the res under Settings and hit Alt+Enter again.
(Settings are saved in PuzzleDimension.yourusername.config in the install rep, but editing the file will corrupt it.)
4:3
16:10
16:9
Multi-mon is also Hor+, with a slight HUD issue: http://www.widescreengamingforum.com/forum/viewtopic.php?t=20380