The best alternatives to Rock-Paper-Scissors-Lizard-Spock are TensorFire, Rock-Paper-Scissors, and Lizard. If these 3 options don't work for you, we've listed a few more alternatives below.
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Lizard is an online guessing and trick-winning card game for up to 6 players. Your goal is to pick a number and win exactly as many times as you said you would. Not more, not less. Use special cards and rules to ruin your opponents.
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You probably know what Rock Paper Scissors (RoShamBo) is. In this game I made for fun one weekend you are randomly assigned to another player who is also using the app and compete against them one on one.