Play BrowserQuest | free online adventure game
Use the mouse to move around and attack.
BrowserQuest, players can interact with each other using the in game chat system, or by working together to defeat enemies. There are achievements available to unlock as one plays. Loot is dropped when players defeat the enemies, which can be picked up by any player. Loot includes the invincibility potion, which changes a player's outfit to appear like the Firefox logo, and various gear. At one point in time, the system recorded over 1,900 concurrent users playing at the same time.