Online since 2002. The most comprehensive site for all around twisty puzzles.

Openable puzzle
Bank SphereA hollow spherical 3x3x3 that can be opened in its solved state.
Bank sphere (political map)A hollow spherical 3x3x3 that can be opened in its solved state. Shows a political map of the world and labels in english or french.
Coin Chest PuzzleModified version of Treasure Chest to allow coins be placed into it. One face was replaced and two corners were cut into.

Gift CapsuleA shape variant of the Turn Apart.
Gift Capsule Mid SplitAn enhanced version of Gift Capsule with a completely new mechanism.
Gift Capsule SkewbThe concept of Gift Capsule implemented with the mechanism of a skewb.

Gift Cube (aka Treasure Chest)A cube which is hollow and can be opened when solved.
Gift PyramidThe concept of the Gift Cube applied to the Pyraminx.
Hinged Gift CubeA variant of Oskar van Deventer's original Gift Cube with hinges.

Hinged Treasure ChestA mass produced Treasure Chest with four pieces replaced. The result resembles the Hinged Gift Cube without being identical.
Matryoshka Spheres PuzzleFive Treasure Skewbs designed to to fit inside of each other just like the famous dolls of the same size.
Mirror Chest SkewbA Treasure Skewb transformed into a "bump"ed variant.

Peekaboo CubeA holey Treasure Chest with a scrambled Micro Rubik's Cube inside. The cube is much larger than the holes. A stand is attached to one edge piece.
Rubik's BankA hollow 3x3x3 which can be used as savings box.
Rubik's SafeIt looks like a 5x5x5 but is a 1x1x5. A poor man's Treasure Chest.

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