Sandbox mode is a game mode in Werewolf Online. New roles that need to be tested by players are first introduced in this mode. Many roles such as Witch, Beast Hunter and Junior Werewolf were first introduced to the game through Sandbox mode. Roles change every week or so, similar to Quick Games.
- Sandbox mode's official language is English. There are no separate servers for different languages. You might be warned if you do not speak English in these games.
- Subsequently, the flag icon for sandbox mode is just a gray box with a question mark in it, not an actual flag.