This is the classical card game of speed. Battle it out with another player from anywhere in the world! If you don't know how to play speed then look it up. The basics is that you want to get rid of all of your cards. You have to place cards in the center deck that is either 1 above or below the current number in the center deck.
If you want to learn how to make online Scratch games, go to the wiki. This stuff does take time to understand since Cloud Variables are still very unstable and unreliable. Alpha Test: Multiplayer Mechanics Finished. Game not ready to play yet.