Best multiplayer browser games to play with friends

Realm of the Mad God is a multiplayer shooter game developed by Wild Shadow Studios and Spry Fox in 2011. Team up with dozens of players and battle through the Realm of the Mad God, Oryx. 

Slither.io is a free casual multiplayer game developed by Steve Howse in 2016. This game lets the player control a worm to get multicolored pellets. It is also available on iOS and Android devices. 

Old School RuneScape (OSRS) is an MMORPG by Jagex. As a response to the current RuneScape, OSRS is still the same old game but with improvements and updates. The free-to-play game has simple graphics and easy point-and-click interaction.

Tribal Wars is strategy game set in the medieval ages developed by InnoGames GmbH. Start off with a small village and buy upgrades while raising your army. Band together with other players with its online feature and battle with other tribes.

Town of Salem is a multiplayer strategy mystery game developed and published by BlankMediaGames. Released in 2014, this game can be played on Windows PC and macOS computers.

Agar.io is a growth arcade-like game where the player starts off as a small cell that must consume smaller objects to grow larger. Developed by Miniclip.com, this game is available to play on browsers, iOS, and Android.

Illyriad is a free real-time strategy multiplayer game developed by Illyriad Games Limited in 2010. Also available on Windows platform, this game became a part of the top 2 MMOs IndiDB's Indie of the Year Awards in 2011. 

Drakensang Online is a browser multiplayer role-playing game developed by Bigpoint Berlin which was released in 2011. This game received German Developer Prize and won Best Browser Game at the German Video Game Awards.

Pokemon Showdown is a Pokemon battle simulator. Play online battles with randomly generated teams, or build your own in this fully animated free game. You can also watch other user's battles.

War Brokers is a browser-based, open-world war game wherein players compete against opposing teams to complete set objectives. The game has plenty of varying game modes and maps available to play with.

Kingdom of Loathing is a multiplayer role-playing game that can be played on web browsers. This video game was released in 2003 and features fighting monsters, gaining skills, completing quests, and a lot more.

Travian is an online real-time strategy game in which you have to build and expand your own empire. Explore a vast world, play with thousands of players and make your civilization flourish to conquer the world.

Vikings Village: Party Hard is a multiplayer browser game. In this game, players will play as a pixel Viking. The game starts with a party that will later turn into chaos. Vikings fight, punch, and kill each other to stay at the top of the leaderboard.

Transformice is an online multiplayer game, It can be played on different platforms such as Android, Microsoft Windows, and Linux. The game's main objective is to collect cheese pieces from different map locations.

Everybody Edits is a multiplayer world creator game. Players can create their own world and challenges then challenge other players to finish it. Players can start with simple challenges and work their way to bigger and more complicated ones.