Competition

A World Record is something every cuber dreams of having. It is the most prestigious accomplishment. And there are many different kinds of competitions.

First, who can solve the puzzle in fewest time. (most of the cubers participate in)

https://ruwix.com/the-rubiks-cube/history-of-the-world-record-evolution/

And the most common one is 3*3*3. The world record keeps on updating and now it is 4.9second held by Lucas Etter.

(regulation: After observing the cube in 15 seconds, put both hands on timer and it starts timing once hands leave and stop until both hands are on timer)

There are also competitions for other kind of cube, like n*n*n, megaminx, pyraminx, square and clock. (I’ll introduce them in other article)

Second, different way to solve the cube.

Blindfolded

Like what it called, the participants have to remember how to solve it and finish it with an eyeshade. It is a challenge to one’s memory and technique. The fastest world record is 21.05seconds held by 林恺俊 (p.s. the time of observation is also included!) 

and the record of multiple blindfolded is 41 cubes completed by Marcin Kowalczyk (it sounds so ridiculous that I can’t believe it until I saw the video.)

One-handed folded and Feet

Some cubers wants to challenge their flexibility, so they try to solve the cube one-handed or by their feet.

Finally, fewest move. I thought it is the most difficult way to play. The participants have an hour to answer the step to solve it and the one finishing it in fewest move will be the winner. 
resource:
https://www.worldcubeassociation.org/results/regions.php