In 1974, Ernő Rubik – a professor of architecture at the Budapest College of Applied Arts in Hungary – completed the first prototype of the Rubik’s Cube.

Since then, the Rubik’s Cube has become one of the best-selling toys of all time, selling over 350 million units.

Dutch puzzle designer Oskar van Deventer has taken the Rubik’s Cube to the next level, creating hundreds of imaginative puzzles based off Ernő Rubik’s concept.

Oskar, who was born in 1965, began designing puzzles at the age of 12, and was 15 when the Rubik’s Cube was introduced to international audiences in 1980.

One of Oskar’s designs is an insane 17x17x17 cube featuring differently sized pieces to offer an additional challenge.

Last November, Kenneth Brandon – a YouTube-famous “twisty puzzle” enthusiast – tackled that cube in just over seven-and-a-half hours.

Here’s a time-lapse that speeds the process up to a little under six-and-a-half minutes:

“The way you solve a 17 by 17 is just like you would a seven by seven, or a five by five. If you can solve one of those then the 17 by 17 isn’t that hard, but it is very, very tedious,”

Brandon (aka RedKB) informs viewers in his video.

While the 17x17x17 cube may not be all that tricky for master puzzlers like Brandon, it does offer a nearly limitless amount of different possible positions.

According to calculations provided by Brandon in the video description, the cube offers 66.9 quinquagintatrecentillion (6.69 x 10^1054) distinct combinations. Another way you can think of that number is 669 with 1052 zeroes after it.

Oskar van Deventer created a cool video where he takes apart the 17x17x17 cube to show you the inner-mechanics of it if you’re curious about exactly how it works:

Here’s another quick video that delves deeper into the mind of the master puzzle maker.

Check out more amazing puzzles on Oskar van Deventer’s Shapeways store.

Read 9 cool facts about the Rubik’s Cube from International Business Times.

Read the original story from The Verge.