====Colours & Colour Clash====
The cell based colouring used on the Spectrum has its disadvantages. [[image:clash.png|right|thumb|Colour clashing in Knight Tyme. Observe the appearance of the character sprite as it merges with the background. Background colours have priority here in this game.)]]
When moving a sprite over a background, or a sprite over another sprite, and if both have colours you have to decide which colours take priority.