We bet that if you are fond of browser games, you will agree that one of the best representatives of this amazing universe is Io series. These are highly-competitive titles that involve numerous players (up to 200), who join the battlefield and fight. The games can have different characters, environments, and plots, but there are two main features all Io entertainments share – you need to develop all the time and defeat other players to survive. The one who manages to become the most advanced player, will win the battle.