This is quite an old tutorial now but seems to still generate strong reviews on the TES resource bank so I thought I may as well drop it back on here too. Anyway it's a fun little game that I made where you control a shark that has to catch fish and avoid other animals. Simple stuff really and the kids do seem to enjoy it.

cone   Vid 1 - move the shark 
cone  Vid 2 - move the fish
cone   Vid 3 - more fish and a crab
cone   Vid 4 - timer, background and more