Abstract
Players drop out game playing when the game is too difficult and could not achieve. But some players play repeatedly until to succeed even if the game is so difficult. We implemented the testing game and conducted an experiment on the difficulty and the failure repetition. As a result, majority of players who dropped out less than 10 times repetition. And not less than 10 times repetition players had short repeat interval. On the other hand, more than 20 times repetition players did not drop out until to succeed. It suggested that players who repeat until success have strong engagement to the game, and the degree of this engagement can measure at repeated intervals.