WikiMage is an online web game based on Wikipedia which is a free, collaboratively edited, and multilingual Internet encyclopedia. The name WikiMage is a combination of Wikipedia and Image that implies the game is built on those images referenced by Wikipedia articles. The WikiMage will challenge the players in terms of their width and depth of knowledge. During the game, a large number of pictures will be presented, and only the player who is able to distinguish the potential relationships between those images can win the game. It is deployed in CoSCo Demos server. By the time this article is composed, WikiMage is accessible through its URL.