I find the contest interesting. Never seen anything like it. It's a videogame decathlon (but with 12 games).
Game list:
Physical Challenges
1. 2D Shooting (Mushihime-sama)
2. 2D Fighting (Under Night In-Birth Exe:Late[st])
3. 3D Fighting (For Honor)
4. First-person Shooting (Tom Clancy's Rainbow Six Siege)
5. Racing (Dirt Rally)
6. Sports (Steep)
Mental Challenges
1. Real-time Tactics (Planetary Annihilation: Titans)
2. Real-time Strategy (Sins of a Solar Empire: Rebellion)
3. Turn-based Strategy (Sid Meier's Civilization IV: Beyond the Sword)
4. City-building (Factorio)
5. Simulation (IL-2 Sturmovik: Battle of Stalingrad)
6. Survival (Rust)
The idea of the BEST PLAYER IN THE WORLD comes from the definition of the decathlon:
https://en.wikipedia.org/wiki/Decathlon
Traditionally, the title of "World's Greatest Athlete" has been given to the person who wins the decathlon, thus the world's greatest athlete of all times is the recordman of decathlon (Kevin Mayer as of September 2018). This began when King Gustav V of Sweden told Jim Thorpe, "You, sir, are the world's greatest athlete" after Thorpe won the decathlon at the Stockholm Olympics in 1912.