Don't stack too many. Thats how. Only use 2-4 layers I think. Energy can be stacked infinitely ish
you can stack elements by using the prop tool and setting the x and y coordinates of one particle to be the same as the particle you wish to stack it with. there is no wiki as it is not encouraged. look up user:mecha-man and check out his counters for some amazing layering work. you can delete one layer at a time using the CTRL key with right click delete and dragging a delete box around the item you wich to remove a layer from. Expect the unexpected when layering. if you put more than 5 particles on the same cooridainates it will become a black hole.