In December 2020 there was a logic puzzle advent calender on mathebau.rocks. These puzzles will be uploaded to the puzzle portal in the next weeks.
Rules: Place some black cells in the diagram such that every arrow points to the corresponding number of black cells. Black cells cannot touch horizontally or vertically. Draw a closed loop through all empty cells, which goes horizontally and vertically from cell to cell. Not every black cell has to have an arrow pointing on it.
Solution code: Column 4 and 15 (top to bottom): X for a black cell, L for a turn in the loop, I (capital i) for a straight loop segment
on 25. July 2021, 13:08 by CJK
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