OS is official term for a previous version of the OS game that was introduced from a backup of the OS source code as it had been on 10 August 2007. For OS players who have no time to level up their characters, they can always hire OS Boosting service's sellers or power-levelers via G2G.com to help them reach the highest level in the shortest possible time.

The game works similarly to OS Classic in that it can be played with the same account that one plays the main version of the game; yet stats, items and quests are separate and non-transferable. All players regardless of achievements in other versions of the game begin OS on tutorial island with a blank character. Newly added to the game include the God Wars Dungeon (which was not completed on 10 August 2007), although it was not the same as it was when it was released into the main game.

There is content that exist that has never been seen before in the games history hence is exclusive to OS. For example, the Wilderness Rejuvenation introduced six new bosses in the Wilderness that drop the dragon pickaxe (which doesn't exist in 2007) and components for mage and range equivalents to the obsidian shield.So if you're a OS veteran hungry for nostalgia or just a member who's curious about OS history, feel free to venture ahead! To enhance your adventure and compliment your gameplay, you can buy OS boosting service from our list of reputable sellers here at G2G.com.