This method almost immediately gives a solution to N-puzzle problem, however it is usually not the optimal one.

解法能在很短时间内给出N数码的一个解，不过这个解通常不是最优解。

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Characterized by large search space, Puzzle problem is often used in AI research to test the performance of kinds of searching algorithms.

在人工智能研究中，数码问题常被用来作为一些搜索算法的测试实例。

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Put a daily calendar with a puzzle, problem, or poser on your desk.

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The Spanish puzzle illustrates a deeper problem for the eurozone.

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Like all such games, Resonance has the problem that there is generally only one right answer to a puzzle, and only one way to get to it.

FORBES: Review: Resonance - A Smart Techno-Thriller In A Classic Format