Play free game ninja.io at candycrushsoda.co! Ninja.io is an amazing multiplayer shoot-em-up with cool ninja gameplay. The action and gameplay is fast-paced and you must have really quick reactions to prevail. You control a single ninja stickman character and you must use the WASD keys to move your ninja around the level. You can perform a range of jumps, tricks and moves to bamboozle your opponents.