Club Penguin Card Jitsu in 3D VR‚ Card-Jitsu was a multiplayer 2D card game in Club Penguin‚ introduced in 2008․ Players battled using elemental cardsFire‚ Water‚ and Snowin a rock-paper-scissors style․ Winning earned belts‚ progressing from white to black‚ and eventually let players challenge Sensei‚ the ninja master․