UB64 is a solitaire-style puzzle game. You move the coloured balls around the board, but can only do so by jumping them diagonally one over the other. If you can read Japanese you'll be lucky enough to know exactly why you are doing this. If not, then you'll probably end up like me and turn it off after about a minute. The ear-grating rendition of 'Michael Row the Boat Ashore' that repeats ad nauseam in the background seems to have been put there for no other purpose than mental torture.