I originally wrote this for Pocket PC in 1998. Around 2000 I re-wrote it for Palm. Now I've written an iPhone version.
The game is based on tic-tac-toe. But some of the squares will have objects in them, and the objects have special properties.
Treasure chest: randomly gain or lose points
Eraser: you can erase one of opponent's pieces
Bunny: hops around and gets in your way
Dragon: eats your piece
Bomb: eventually blows up your piece (and sometimes the bunn)
Arrows: exchange X's and O's
x/o: switches back and forth between X and O
And a few more suprises (watch out for the stealth bomber).