Sandbox mode in Reminiscence Zombies is available through Private Servers , and it can be toggled from the Reminiscence Hub once you’re in that server.

How to turn it on

  1. Join or create a private server for Reminiscence Zombies.
  1. Enter the Reminiscence Hub in-game.
  1. Use the hub’s option to toggle Sandbox mode.

Important note

  • This is not shown as a normal public-server setting; the game listing says Private Servers offer Sandbox mode.
  • A community page also describes Sandbox as a mode tied to the game’s modes system, which matches the private-server access note.

Quick check

  • If you’re in a public server, you likely won’t see the toggle.
  • If you’re already in a private server and still can’t find it, look specifically for the Reminiscence Hub menu or a mode-switch option there.

TL;DR: Join a private server, open the Reminiscence Hub, and switch Sandbox mode on there.