Embodiments of the present invention monitor and dynamically manage game instances within a game service. A game service provides a remote gaming environment to which users connect over a wide area network, such as the Internet. For example, embodiments of the invention may forecast demand for a specific game title. The demand forecast is used to determine how many standby game instances are needed to meet demand as players join and leave game sessions. Games with higher demand may have more standby game instances ready for players to drop in. Games with less demand may have fewer active game instances running waiting for players to drop in.