Building a Sandbox

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In a “sandbox” game, you give the players a sizable location to explore and let them decide how to go about it. A sandbox doesn't have as many time-sensitive events as a directed adventure, and the flow of the game is driven more by the players than by the opposition. You can put self-contained dungeons or other locations within the sandbox, but it's up to the players when and how to visit them or deal with them.

To make a sandbox, create about triple the number of encounters and spread them out among multiple locations or factions. You can expect the PCs won't deal with all of them. In most cases, you'll want to determine where the PCs are headed next before the end of a session so you can prepare for the next session. Depending on the size and complexity of the location, the number of encounters might be much higher.