It continues a strong start for the free-to-play title, which attracted six million players within 24 hours.
Meanwhile genre leader Fortnite attracted 10 million players in its first two weeks, according to Niko Partners analyst Daniel Ahmad, who said Warzone is now the fastest growing non-mobile game of all time.
He also tweeted the following comparison:
Number of Call of Duty Warzone players after:
1 day – 6m
3 days – 15m
Number of Apex Legends players after:
1 day – 2.5m
3 days – 10m
1 week – 25m
4 weeks – 50m
Number of Fortnite BR players after:
2 weeks – 10m
6 weeks – 20m
11 weeks – 30m
16 weeks – 40m
Call of Duty Warzone is an 18-22GB download for Call of Duty Modern Warfare owners and an 80-101GB download for everybody else – a sizeable download which could have put some players off trying the game.
It launched with two 150-player game modes, Battle Royale and Plunder, although developer Infinity Ward has said Warzone will support 200-player matches in the future, and that it’s working on new game modes.
Warzone shares the same Battle Pass and item shop as Modern Warfare. While Modern Warfare isn’t required to play Warzone, players who do own the game can access all their customisation items as progression is unified across the titles.
Infinity Ward has said it’s investigating Call of Duty Warzone crashes on PC.
For more on the game, see our Call of Duty Warzone Tips: 19 things you didn’t know feature.