Mosaic

Race: first to fill their mosaic wins.
Kaleidoscope: the game ends when someone fills their mosaic. Each grand shape scores 1 point per different colour, up to 7. Finishing is worth +3. A new shape with no free slot replaces your weakest one if it scores higher.
Monochrome: like Kaleidoscope, but each grand shape scores the number of cards in its most common colour, up to 8.
Rainbow only: only grand shapes containing all 7 colours fit your mosaic. Others shatter. First to fill wins.

How to play

Every move is scored with the same judgement the computer rival uses. Treat it as a guide, not a perfect player.

Send them this link. The game starts when they open it and pick a name, and you each play on your own screen.