A Drophole is an board with one or more holes drilled in it, the holes are big enough that a marble can drop through it. Underneath the board, there is a sidepath which is usually longer and slower than the main path. So marbles have better to avoid them. Sometimes, another obstacle like a pin or block can be placed just beyond the hole which will block marbles jumping over the hole so they will fall through the hole and taking the slower sidepath.

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