Oskar van Deventer

Many of his combination puzzles are in mass production by Uwe Mèffert and WitEden. Deventer has also designed puzzles for Hanayama. He was a Guinness World Record holder for his 17×17×17 "Over the Top Cube" Rubik's Cube-style puzzle from 2012 to 2016, when it was beaten by a 22×22×22 cube. In addition to being a puzzle maker, Oskar is a research scientist in the area of media networking and holds a Ph.D. in optics. He has over 100 publications, over 80 patents applications, and hundreds of standardization contributions.

• Name — Oskar van Deventer • Birth Name — Mattijs Oskar van Deventer • Born — 1965 • Birthplace — Wageningen, Netherlands • Occupation — Puzzle maker, Senior Scientist at TNO • Known for — Puzzle designer, inventor • Title — Ph.D. in optics • Illustration — Gear cube

• Gear cube: Previously named "Caution Cube" because there was a big chance to pinch your fingers with the gears. It was mass-produced by Mèffert's in 2010, but over time it appeared as several copies and shape mods of the same design. • Gear Cube Extreme: A bandaged version of the Gear cube, where 4 gears are replaced with 4 standard edges, making the puzzle harder. It was mass-produced by Mèffert's in 2010, and was also copied by other companies. • Gear Shift: It was mass-produced by Mèffert's in 2011; a knock off version also appeared. • David Gear Cube: Previously called "Polo cube" in reference to Alex Polonsky, who had the idea. It was mass-produced By Mèffert's in 2013. • Geared Mixup: A variant of the gear cube where all faces can perform 90° rotations, allowing centers to be interchanged with edges, hence the term "mixup". It was mass-produced by Mèffert's in 2014. • Geared 5×5×5: An unknown Chinese company mass-produced this puzzle in 2015 using a 3D printed sample, without the permission of Oskar. An agreement was met to please both sides. • Gear Ball: A mass-produced spherical Gear cube made by Mèffert's. • Mosaic cube: Previously called "Fadi cube", it is a corner turning puzzle with two cut depths similar to Okamoto and Greg's "Lattice Cube". It was mass-produced by Mèffert's in 2010. • Planets puzzle: Four balls in a frame. Craters on the balls block and unblock movement on the adjacent balls. • Rob's Pyraminx: It was mass-produced by Mèffert's in 2014. • Rob's Octahedron: It was mass-produced by Mèffert's in 2015. • Mixup Cube: a 3×3×3 Rubik's cube that can perform 45° rotations on the middle layers, allowing centers interchange with edges. It was mass-produced by WitEden. • Treasure chest: A 3×3×3 puzzle that when solved, can be opened, revealing a small chamber inside. It was mass-produced by Mèffert's. • Icosaix: A face turning icosahedron with jumbling movements. It was mass-produced by MF8 in 2015. • Crazy Comet: Was mass-produced by LanLan without Oskar's permission in 2016 but a deal was achieved later. • Redi Cube: A corner turning puzzle mass produced by Moyu in 2017.

Oskar van Deventer is recorded as designer.