If you're looking for a simple puzzle game to kill some time on the bus then install Brixster onto your Palm.
Brixster is an easy-to-play game where your mission is to reveal the picture behind the grid. You do this by connecting Tetris-style blocks together in order to complete lines. Once you've made a line, the blocks in that row will disappear and a part of the picture behind will be revealed.
Brixster is one of those games you can pick up and start using without really thinking. Moving the pieces is just a matter of tapping on the piece you wish to move then clicking on the space you wish to insert that block.
That's about it really. There aren't any options or settings to speak of, and you simply proceed through increasing levels of difficulty. Unfortunately the demo version of Brixster is quite limited, and you can only play a maximum of five levels before the trial runs out.
Nevertheless, if you want a quick-fix of puzzle action, Brixster provides an amusing diversion.