Switch! is a puzzle game for RISC OS from the early 1990s in which you are up against the clock and have to match up as many groups of two or more like-coloured counters on the bottom row of a rack to make them disappear and build up your score.
Counters are moved around by switching those either side of the one you click on, and when they disappear, more are dropped in to replace them.
There are nine difficulty settings that affect the number of differently coloured tiles (the more colours, the more difficult the game) coupled with ten different time limits ranging from thirty seconds up to five minutes, which means ninety different skill levels overall - and there is a separate high score table for each one.
To be confirmed.
This game is not currently available for download, but will be in time. Please be patient.