Players can also create mergers even when there's not an AI merger that can mislead them into tracing a wrong neuron/segment(s). Be it misalignment(s), no-borders (usually shown as pure white in the 2D), fuzzy, unclear borders and so on. There have been a couple of isolated cases of players who traced everything in a cube on purpose. They were caught and "gifted" by the GrimReaper with -10,000,000 points and subsequent removal from the game.
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This is a good example of a no-borders merger created by players. The circled piece in the image is to show where the merger is. It is usually presented in extremely white in the 2D and such segments must never be added even if they make a bouton/branch/nub/etc rounder and fuller as they do not belong and may lead to larger merger creation.