This is a Heyacrazier puzzle, a variant of Heyacrazy. Rules of Heyacrazy: > - Shade some cells of the grid. > > - Shaded cells cannot be orthogonally adjacent; unshaded cells must be orthogonally connected. > > - When the puzzle is solved, you must not be able to draw a line segment that passes through two borders, and does not pass through any shaded cells or grid vertices. > >For an example puzzle and its solution, see [this question](https://puzzling.stackexchange.com/questions/87231/heyacrazy-crosses). Rule change for Heyacrazier: > - **The forbidden lines are now those that pass through *three* borders, instead of two.** Lines that pass through only two borders are acceptable. [![enter image description here][1]][1] [1]: https://i.sstatic.net/JgjOH.png