The developers of Fornite have recently dropped some stats for the game’s Battle Royale mode, and some of the early results are extremely impressive.

Fortnite BR Sunday Update: 525K PCU and 3.7M DAU (NA, EU, OCE)! Thanks everyone! — Fortnite (@FortniteGame) October 9, 2017

According to the tweet above, Fortnite Battle Royale saw a whopping 525,000 PCU (Peak Cocurrent Users) and 3.7 million DAU (Daily Active Users) on Sunday alone. For those unaware, concurrent users are how many people were online at the same time, while daily active users are just how many total people played. Regardless, these are some ridiculously great stats for a game mode that hasn’t been out for all that long.

While it still doesn’t quite hold a candle to the likes of PlayerUnknown’s Battlegrounds, it is impressive nonetheless. Needless to say, it’s been an odd pivot for Fortnite, as it seems the game is gaining more popularity thanks to its Battle Royale mode than anything else. If you somehow haven’t heard of Fortnite Battle Royale, check out this helpful FAQ from Epic Games:

What’s Fortnite Battle Royale?

It’s a 100-player PvP mode in Fortnite that will be free for everybody on Sept. 26. One giant map. A battle bus. Fortnite building skills and destructible environments combined with intense PvP combat. The last one standing wins. So, what’s the catch?

No catch. Fortnite Battle Royale is free and we will not sell items that give a competitive advantage. At some point in the future we will sell other things including cosmetics or compendium-like content. Squads are Coming!

On September 26, Fortnite Battle Royale will introduce squads. Also, we’re working to improve the feel of combat, controls, weapons, movement and inventory. “Save the World” PvE Updates

Fortnite’s “Save the World” PvE campaign remains in paid Early Access and we have lots of great updates in the works including the previously announced “Block Party” mode and some spooky October content. How Can I Play?

On September 26, Battle Royale will be available as a free download on the Epic Games PC launcher, PlayStation Store and Xbox Store.

Fortnite Battle Royale is available now for free on PlayStation 4, Xbox One, and PC.