This is really fun to watch.
The world champion plays this online tournament as "Dr. Nykterstein". This is an "arena" tournament, which is like a "Battle Royal" to see who can get the most points over a two hour period. The tournament is mostly Grandmasters, making the level of play high. It looks like Magnus Carlsen may have started late but then slowly moved up the standings until he was on top.
What is amazing is that this is a "bullet" tournament, where each player only has 1 minute to make all their moves. The players are averaging 1 to 2 seconds per move. It is all I can do to keep up the games. I get the impression that Magnus Carlsen's moves are at least equal to what I can do with two hours at my disposal. It is amazing and instructive to watch.
The video gets off to a slow start but gets really entertaining 3 to 4 minutes into it.