0. Pause the sim.
1. Make a rectangle.
2. Cut out a hole and replace it with PSCN or any other element that allows life.
3. Press ` or ~ and type "set life PSCN 50".
4. Repeat steps 2 and 3, but change number 50 to a higher number, e.g. 50, 100, 150, 200.
5. Save the sim.
6. Unpause and watch it go!
Least important part: Saving.
Most important part: Steps 0-4. Life value is needed.

Proof it works [unpause the situation] :

Unpause the simulation.

chemical_samurai:

its

291534View Save 291534

, thats how you write it

I already did it.

chemical_samurai:

yea it really isnt all that good, and its not exactly moving objects

It is, it leaves a trail behind that's all.