Sand box mode?

[EternalGolem]

Just imagine, under Load game it says "Sandbox." You click it and some loading happens. It then opens up an 150m by 150m vacuum. You can place any type of block, sediment, liquid, gas, pipe, wire, building, and entities (dupes, resources).

Sandbox mode would be locked, you must complete at least one +15 cycle colony, just so you know how the game works.

I would like this as I would use it to plan out rooms and interactions for later down the line. Rooms like battery storage that doubles as a water purifier. Different gas behaviors in oxygen production rooms. Disease effects on dupes. Stability of food sources. Just stuff I question.