MegaHouse Dismantle Puzzle Lite 02: Sea Urchin Puzzle

This is a 3D puzzle of sea urchin. The "sea urchin" is completed by assembling the seven disparate parts. The puzzle looks easy but is exquisitely difficult to solve.

Contents of the set
1 shell (top), 1 shell (bottom), 5 sea urchin parts.

How to play
1. Place the sea urchin parts in the exact same position.
2. After all the sea urchin parts are in place, place the shell (top) over the sea urchin parts.
3. When all the sea urchin parts are in place, place the top shell on top of the sea urchin parts. If there is a gap between the top and bottom shells, it is a failure.