Redstone Bug – Minecraft Wiki

A redstone bug was a hostile mob present in Java Edition 2.0, similar in form to a silverfish. Redstone bugs can spawn if a redstone wire increases the strength. The chance that they spawn is 1%. The chance increases for every redstone bug in a 7x7x7 area by 5%. The Color value of the bug can reach from 33292288 to 66846720. Redstone bugs, effectively being reskinned silverfish, shared all of their behavior. Redstone bugs used the ID of silverfish, different from them only by a newly-added Color

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