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Easy to open but difficult to separate, Slider features a gliding action reminiscent of a switchblade. Though two of the pieces resemble old-fashioned straight razors, don’t worry about cutting yourself. In fact, Slider is a joy to handle and features a surprisingly entertaining mechanism. Unlike some of our other pocket puzzles, if you pay attention when you separate the three interlocked pieces, you shouldn’t have too much trouble linking them all back together again.

Designed by Finnish designer Vesa Timonen for Hanayama of Japan.

Difficulty: 3/6