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This is a pocket-sized Huzzle puzzle.
Cast Keyhole is a challenging maze. At first glance, the two pieces have simple concave and convex angles on their flat surfaces. However, when the two pieces intertwine, they take the shape of a 3D maze. You must twist and turn them around. If you rush without thinking, you will come to a dead end. Be careful as you may end up going around in circles.
Theme: Groove
The Huzzle Cast Keyhole puzzle has a difficulty level of 4 (on a scale of 1 to 6).