15-puzzle is a simple game concept which doesn't stop it being quite addictive.
'Game of fifteen' was invented by Noyes Palmer Chapman in 1874 as frame of numbered square tiles in random order with one tile missing.
Contrary to the original version, today's implementations instead of numbered tiles usually using sliced pictures.
This allows make a tests of CPiC conversions.
Current version contains 6 levels, using all 3 CPC graphic modes.