Hanayama Puzzle - Keyhole Lvl 4

Here 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.The theme is "groove." Designed by Vesa Timonen from Finland. ​Hanayama is known worldwide for challenging puzzles and quality manufacturing. Can you take the pieces apart, then put them back together again? Hanayama cast metal brain teasers have 6 levels of difficulty, and each puzzle is Mensa-rated. Level 4 puzzles are considered challenging by most puzzlers. Skill Level: 4 Age: 12+