Users: The functionality should be available to both the game owner , and any players promoted to the GM role . Feature: This would introduce the capability of locking a game from entry to all non-owner and non-GM players. Ideally just having a Lock/Unlock Game button on the game page would encompass the user experience. Game owners and GM's will always be able to enter the game. Additional Option: A setting to simply disallow players from launching the game unless the GM is already in game. Similar to a feature most online meeting tools have around a host starting the meeting and a waiting lobby. This can be manually handled through the feature above if determined not to warrant its own functionality. User Story: There are game management and creation activities which can be performed with more efficiency when players are not in the game. Aside from the immediate prevention of interruptions to work the GM is doing, it also prevents players from moving tokens, editing their character sheets, or asking questions which would be better done in the game forums so all can benefit from the answer.