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Cover the World in Copper Walls

Have you ever wanted every open tile in the world to have a copper wall on it? Well, do I have the schematic for you!

This schematic uses 1 Mega to build a copper wall on every tile that it possibly can, as long as you have enough copper. The bottom right message tracks which tile the Mega is currently building, and the switch on the top left is an emergency shutoff, in case you run out of copper or something. The mega will pick up where it left off after you turn the switch back on. This is a very slow process, and kind of useless, so its mainly for messing around in sandbox mode. It's also kinda janky and might miss some tiles, but oh well.

Schematic code:

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