Challenge Your Friends requires two players and one device. This is not online multiplayer game, but both players play on the same device. Play games for two.
HOW IT WORKS:
Step 1: Find a friend.
Step 2: Choose one of the multiplayer games.
Step 3: The game gives you random challenge.
Step 4: If you both accept the challenge - press ACCEPT.
Step 5: PLAY.
Step 6: When the game is over, do the challenge.
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Challenge Your Friends is multiplayer (two player actually) game and it is played on one device/phone/tablet. There aren't many multiplayer (two player) games like this on the Play Store.
Enjoy while playing Challenge Your Friends!