WCA puzzles is a category of Rubik’s cube-like puzzles that are used in official Rubik’s cube competitions. WCA stands for World Cube Association which is a non-profit organisation that arranges speedcubing competitions and regulates them. The puzzles at competitions are 2x2-7x7, Pyraminx, Megaminx, Skewb, Square-1 and Clock.
The WCA puzzles are some of the most fun and popular puzzles. Not only due to the fact that they were specifically hand picked out to be official events because of how popular and great they are, but also because the spirit of competition makes solving the puzzles over and over fun even after the first few completions.