Memory game for 1 to 4 players. On each turn, pick two cards from the table. If the cards match, you keep the pair and have another go. If the cards don't match, play passes to the next player. The aim is to remember where the cards are on the table and collect as many pairs as you can.
This is the completed working game. I am writing a tutorial to guide you through building your own version. When complete it will be posted with my other Scratch tutorials at https://scratch.pocketfluff.net