Rubik's Clock
Rubik's Clock is a mechanical puzzle invented and patented by Christopher C. Wiggs and Christopher J. Taylor. The Hungarian sculptor and professor of architecture Ernő Rubik bought the patent from them to market the product under his name. It was first marketed in 1988.
Rubik's Clock is a two-sided puzzle, each side presenting nine clocks to the puzzler. There are four wheels, one at each corner of the puzzle, each allowing the corresponding corner clock to be rotated directly.
There are also four buttons which span both sides of the puzzle; each button arranged such that if it is "in" on one side it is "out" on the other. The state of each button determines whether the adjacent corner clock is mechanically connected to the three other adjacent clocks on the front side or on the back side: thus the configuration of the buttons determines which sets of clocks can be turned simultaneously by rotating a suitable wheel.
The aim of the puzzle is to set all nine clocks to 12 o'clock on both sides of the puzzle simultaneously. The method to do so is by starting by constructing a cross on both sides and then solving the corner clocks.
The Rubik’s clock is listed as one of the 17 WCA events, with records for fastest time to solve one puzzle, and the fastest average time to solve 5 puzzles.
Combinations
Since there are 14 independent clocks, with 12 settings each, there are a total of =1,283,918,464,548,864 possible combinations for the clock faces. This does not count for the number of pin positions.Records
The world record for a single solve is 3.29 seconds, set by Suen Ming Chi of Hong Kong on 23 March 2019 at GDSY Open 2019 in Guangzhou, China.The world record average of 5 is 4.38 seconds, set by Yunhao Lou of China on 9 November 2019 at Hangzhou Autumn 2019 in Hangzhou, China, with the times of 4.16, 4.81,, and 4.17 seconds.
Top 5 solvers by single solve[World [Cube Association]] https://www.worldcubeassociation.org/results/events.php?eventId=clock®ionId=&years=&show=100%2BPersons&single=Single Official Clock Ranking Single
| Name | Fastest solve | Competition |
| Suen Ming Chi | 3.29s | GDSY Open 2019 |
| Dmitry Gundin | 3.34s | MPEI Open 2019 |
| Yunhao Lou | 3.40s | Shenzhen Open 2018 |
| Evan Liu | 3.51s | George School Open 2019 |
| Tairan Zhong | 3.64s | WCA Asian Championship 2018 |
Top 5 solvers by average of 5 solves[World Cube Association] https://www.worldcubeassociation.org/results/events.php?eventId=clock®ionId=&years=&show=100%2BPersons&average=Average Official Clock Ranking Average
| Name | Fastest average | Competition |
| Yunhao Lou | 4.38s | Hangzhou Autumn 2019 |
| Tairan Zhong | 4.53s | China Championship 2019 |
| Dmitry Gundin | 4.99s | MPEI Open 2019 |
| Suen Ming Chi | 5.04s | GDSY Open 2019 |
| Wojciech Knott | 5.14s | Polish Championship 2018 |