My first nomination - Transylvanian Tower.
Not so much the game movement. It's each time you want to look up the map of the current level - it takes over 30 seconds to display the flippin' thing.
And then it only gives you 10 seconds to look at it, part of which time is probably spent waking yourself up.
I reckon you could probably generate a map in 30 seconds, let alone render an already generated one. But no - at the start of the game it takes over 2 minutes to create the map.
I haven't looked at the program listing (as it's unfathomably saved as a Bytes: loader) but I reckon it must be possible to do a better maze generating algorithm, even in BASIC...
