Last week saw Epic announce and beta launch a battle royale mode for Fortnite. In its announcement, Epic referred to PlayerUnknown’s Battlegrounds, the battle royale multiplayer shooter that has shot to the top of Steam, and players were quick to draw comparisons between the two games. However, PUBG’s developers, Bluehole, have said that they are concerned with the similarities between the two games.

If you’re looking to play something other than battle royale, here’s our Fortnite guide for the core game.

“We’ve had an ongoing relationship with Epic Games throughout PUBG’s development as they are the creators of UE4, the engine we licensed for the game,” Chang Han Kim, Bluehole’s vice president and executive producer, says in a press release. “After listening to the growing feedback from our community and reviewing the gameplay for ourselves, we are concerned that Fortnite may be replicating the experience for which PUBG is known.”

It wasn’t only Fortnite’s mechanical similarities, Bluehole point to the way Epic have referenced PUBG in its announcements about its battle royale mode. “We have also noticed that Epic Games references PUBG in the promotion of Fortnite to their community and in communications with the press,” Han Kim continues. “This was never discussed with us and we don’t feel that it’s right.”

Currently, Bluehole are only saying they have noticed players’ concerns with the similarities between the two games. But Han Kim also says: “The PUBG community has and continues to provide evidence of the many similarities as we contemplate further action.”