TIC's CPU is being invaded by rival fantasy computers: hold them off through four levels using the built-in zapper. Each level lasts for a minute and you have four 'lives' in total. Shouldn't be too difficult to complete and get a score of 10,000+.
TIC's revenge is based on an old BBC Micro game, 'Transistor's Revenge' (http://bbcmicro.co.uk//jsbeeb/play.php?autoboot&disc=http://bbcmicro.co.uk//gameimg/discs/71/Disc004-TransistorsRevenge.ssd) although it doesn't require the keyboard gymnastics of the original, just the cursor up/down/left/right keys to play on PC.
Could really do with a proper title screen, some explosion effects and proper non-annoying music.