It can subtract up to 16383-16383. I didn't use tutorials, only used my Boolean algebra skills. :) hope it looks cool. Only uses wood, lamps, levers, redstone dust, redstone torches, repeaters, and comparators.
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its what the title says, each layer is 18*15*4 (including the inputs). it can add up to 16383+16383. its carry propagation is about 3 ticks per layer.
3125 kills everyone who understands it/knows about it, including like-minded people. it is stated that close family are almost always like-minded, which means that couldn't there just be a chain reaction between many families even if you're loosely connected?