The ultimate challenge, when trying to extract work from the World of Warcraft questers and other players, will be persuading them that it’s still just a game.

当尝试把玩家从《魔兽世界》或者其他游戏中移出来工作时，最大的挑战是如何说服他们这仍只是一个游戏。

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The last game is the ultimate challenge of the Commissioner checkpoints to see whether you have sufficient ability to challenge the powerful profiled!

游戏最后一关是极限挑战关卡，看看你是否有足够的能力挑战强大的异形吧！

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Jeopardy is seen as the ultimate challenge in the artificial intelligence world because the game's clues involve analysing subtle meanings, irony, riddles and other complexities where humans excel and machines do not.

BBC: IBM supercomputer set for Jeopardy quiz show showdown