Embodiments of the present invention allow players to instantly access and begin playing games through an online service. To make the games instantly available, an online service keeps instances of games running in active memory waiting for a player to be added. The game instances running in active memory are not attached to a player profile or an I/O channel from a game client. Once the player requests a game, the player's player profile is loaded into the running game instance and an I/O channel is mapped from the game client to the game instance. From the player's perspective, the preloaded game instances allow the player to browse directly from game to game with very little delay. To optimize the usage of server-side resources, historical usage data may be analyzed to anticipate demand for different games.