CosmicBreak is a 3D MMO third person shooter featuring anime style characters/mecha and a high level of player character customization. Players own multiple robots whose parts, weapons, etc., can be mix-matched, upgraded, and modified. The game also features a skin editor which allows players to repaint their robots.

The main game mode is a PvP Arena mode, which allows for team battles of up to 30 vs. 30. Elements such as medic-like repair robots and firepower boosting bases for each side encourage the use of team tactics. There are also mission and quest modes where players can battle against NPCs either alone or in a party with others.

Upon registering an in-game account, players are also granted access to the official CosmicBreak social networking website where they can discuss the game with other players, contact the developers, swap skins, organize in-game clans, etc.