MIR4 is a popular free-to-play open world massive multiplayer online, role-playing game (MMORPG), that can be cross-played on both PC and mobile devices. The game invites players to venture into the world of MIR to start their own adventure. Players are able to enjoy the peaceful life of gathering, crafting and hunting. However, players can also join a powerful clan to participate in large-scale player-versus-player (PVP) with other allies and enemies.

Additionally, players can capture the Hidden Valley, collect taxes on profits, set a bounty on an enemy and get assistance from their friends to hunt down enemies. Players are also able to join a 50-player raid in order to get rare items, declare war and participate in castle sieges. Whatever players choose, their story will be legendary.

MIR4 introduced a unique free-for-all loot system. This means that anyone has the right to claim the loot, even players that did not participate in defeating the monster. Players have 30 seconds to protect the loot they want, while others have 30 seconds to fight for the right to claim the loot. However, this only applies to special loot in treasure chests.