SG57 came up with two classics for PSP, also providing source code. This one is a clone of Minesweeper.

Controls:

Move the cursor fast with teh analog stick (good for just starting out randomly selecting squares)
Move the cursor slowly for more precise cursor movement
Press X to activate a square if not already activated and it isnt flagged
Press [] to flag a square as a mine or if it is flagged it removes the flag
Press SELECT to start over and pick your difficulty (easy, intermediate, expert)

Thanks to http://www.dcemu.co.uk for the news.

http://www.psp-hacks.com/2008/07/12/homebrew-hits-minesweeper-and-block-dude/