'''Examples :'''
Bobby bearing
Bomb Scare
Fire Trap
Bobby bearing : yet in this one, the sprites seem to be 2bpp coded as they actually use 2 colours+transparency (White+black for sprites, Darkblue and light cyan for scenery) or there is stil a 1bpp mask over a 1bpp sprite data, then colour are chosen when displayed. This makes the sprites even more apparent over the background despite still having a 1bpp flavour.
There a comparison with the different way to do it :