Yajisan Kazusan

From WPC unofficial wiki

Rules[edit]

Shade some cells so that all unshaded numbered arrow clues indicate the exact number of shaded cells in the given direction. Shaded cells cannot touch each other by a side, and all white cells must form a single connected area. The numbered arrow clue cells can be shaded, and a clue once shaded may or may not be true.

(Rules (modified) from WPC 2017 IB, example by EctoPLASMA)

History of the puzzle[edit]

First appeared on Nikoli vol 74 (1998). The rules was developed together by あさおきたん (Asaokitan) & となりのトロロ (Tonari No Tororo). Surprisingly, this puzzle predates Yajilin.

Appearances in the past WPCs[edit]