Ace Online

In Ace Online, players pilot their own individual starfighters (called "Gears") throughout a number of maps, including terrestrial, lunar, and space maps. It has typical MMORPG elements such as leveling, currency, a skill system and combat mostly based on player equipment and level. Ace Online is a largely player vs. player-oriented game (PvP), with character leveling and item acquisition achieved through combat against non-player characters and the completion of missions.

After the conclusion of certain missions, more maps will be accessible to the player. Although a high level character will have better character attributes than most other players, no one at any level is invincible against other players in PvP. As in other MMORPGs, players can trade items, customize their gears, form parties ("formations") and guilds ("brigades"), and fight with other players via PvP combat. Almost all of the combat in Ace Online is aerial, from the third-person view.

In North America, the game was previously released as Space Cowboy Online through a portal known as gPotato, which was operated by Gala-Net. Space Cowboy Online's client was made available for download on May 22, 2006, and the service went live on May 26, 2006.

On December 26, 2007, Space Cowboy Online was shut down. This was announced to the public with a letter from Space Cowboy's last active GM, "Xarfox".