Door Hinge (Chiyotsui in japanese) is a shading puzzle that cleverly uses region borders as clues. This puzzle type was covered previously here. Here are the rules :
Shade some cells on the board.
- A group of orthogonally connected shaded cells is called a block. Each block is cut exactly once by a single straight segment of region borders, across which it must have reflectional symmetry.
- Numbered regions must contain the indicated amount of shaded cells.
Rules taken from puzz.link - click here for a solved example.
The name comes from blocks of blacks cells behaving akin to door handles as they poke out the door from both side at the same point with the same shape (thus the reflection across borders).
Puzzle 1 (easy)
Puzzle 2 (easy)
Puzzle 3 (medium to hard)
Puzzle 4 (hard)
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