Gift Cube is a fully functional Rubik's Cube with a spherical cavity inside. When solved, one layer comes off and the content can be removed from the cube.

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Please contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.

Gift Cube is produced by Mefferts for Jade Club as Oskar's Treasure Chest.

Plugged Dice is a 60x60x60 mm cube puzzle (same size as Rubik's). It was suggested by Fred Horn. The object is to insert the eight plugs. This is quite a puzzle as each plug can be inserted in many ways, but the whole fits only in one way. The puzzle comes as a kit. When you buy it, you'll have to paint the cube yourself (I typically use a bath of acid-based clothing dye), and glue in the five dots.

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Please contact Oskar directly if you are interested in obtaining a bi-colored sample of this puzzle.

Magic Gears is a paradoxical set of three identical gears that can both mesh in the regular way and all in the same direction. It was inspired by this YouTube video by Jacques Maurel. Maurel writes: "The paradoxical 2 teeth gear set is used in the 'Mercier differential' (using the torque transfer technology) Patented in 1988 by Renault". Oskar's addition to the work is making Chevron Gears as invented by Andre Citroen. This way the three gears become identical and they can both mesh classically and paradoxically.

I have performed this Magic Gears "trick" to several friends, family and colleagues. I get two types of reactions: "wow" and "so what". Apparently, there exist people who are not aware how gears are supposed to mesh :-).

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The set is delivered as a DIY kit. You will have to add five M3x60 bolts yourself.

Geared Mixup is a twisty-puzzle design requested by many people. When playing the original Gear Cube (Caution Cube), players can only make half turns because of the gears. Many people tried quarter turns in vain. Now it is possible, by combining the Gear Cube and Mixup Cube concepts. Geared Mixup has eight geared corners that drive twenty small 4-teeth gears.

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Caution Cube is a twisty puzzle like Rubik's Cube. Its edges have gears that connect opposite faces. Apply extreme caution when solving this novel twisty puzzle. The razor-sharp gears turn, so you can easily hurt yourself. Wear protective gloves and keep this puzzle away from children. This is not a toy!

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Please contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.

Or buy the mass-produced version from Mefferts.com.

Minimal Twist is a twisty puzzle, related to the Rubik's Cube. It is a very minimalistic, skeletal design,even without stickers. The parts are held together by dovetail connections.The puzzle has the geometry of the Skewb puzzle.

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Holistic Ring was designed by Bram Cohen. He decided to come up with a design which has a nice holistic finishing move.

This is the metal version. For production purposes, the four rings are welded together. Some dremeling is needed to separate them.

Cooksey Maze is a maze concept invented by an Englishman named "Mr. Richard Cooksey" in the 1970's. An evolved metal+plastic version with springs and pins was prototyped by Pentangle, but it was never taken in production. Oskar has been trying to locate Cooksey for quite some time, as the original "Cooksey Cilinder" has been an inspiration for many of Oskar's puzzle designs. This is a modified version of the original Cooksey Cylinder with a much simplified mechanism.

Earn a free Cooksey Maze if you can bring Oskar in contact with the original inventor of this maze concept. We know nothing more than his name, the fact that he is an Englishman, and that he already was an adult in the 1970's. Also the people who operated Pentangle in the 1970's do not have more identifying information.

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Also posted at the Renegade Puzzlers Forum (subscription required).

Please contact Oskar directly if you wat to buy a dyed sample of this puzzle.

Fairly Fudged is based on the same strange geometry as the Fairly Twisted puzzle elsewhere in the OskarPuzzles shop. In this version, also the pentagonal face can turn. This required a bit of fudging, hence the name of this puzzle.

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Please contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.