The milestone player count was announced on April 10 – one month or 31 days after the free-to-play title was released.
By way of comparison, fellow free-to-play battle royale Apex Legends reached 2.5 million players in 24 hours, 10 million players in three days, and 50 million players in 28 days, according to developer Respawn.
Warzone launched with two 150-player game modes, Battle Royale and Plunder, although it will support 200-player matches in the future and developer Infinity Ward is working on new game modes too.
The Warzone and Modern Warfare Season 3 update released on Wednesday replaced the Trios playlist with a Quads playlist, while the existing Solos playlist remained available.
No official explanation was given for the removal of the Trios playlist – it wasn’t mentioned in the Season 3 patch notes – and the decision didn’t go down well with some members of the game’s community.
As with Trios, Quads enables you to play in smaller groups by choosing not to fill your squad before entering the game, however this leaves you at a disadvantage as you’re still matched against larger teams.
A much-requested Duos playlist looks set to be added to Warzone during Season 3, according to an image which briefly appeared on the game’s website this week, while Infinity Ward has also playtested five-player squads.
Warzone’s Season 3 update increased the price of Loadout Drops from the Buy Station, from $8,500 to $10,000, and added fresh vehicle skins and weapons, among other features.
Season 3 introduced new Modern Warfare multiplayer maps Talsik Backlot, Hovec Sawmill and Aniyah Incursion, while Hardhat will be added mid-season.