This is a Hinge puzzle. Shade some cells to form blocks connected by sides. Each block is contained in exactly two regions. Each block is mirror symmetric, and the axis of symmetry goes over the region border. Clues in some of the regions count the shaded cells in that region. Play online . I might have overdone the thinking in symmetry bit.
Count Different Arrows Sudoku by Bill Murphy
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(This post is part of the Genuinely Approachable Sudoku (GAS) series.) This
variant, posted initially during our first few weeks of GAS puzzles, comes
ba...
6 hours ago