# Isometric Heyacrazy - Now In 3D!

This is a Heyacrazy puzzle on an isometric grid.

Rules of Heyacrazy:

• Shade some cells of the grid.

• 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.

Special rules for the isometric grid:

• This grid is a three-dimensional structure, not a hexagon. Lines should be interpreted as paths on that structure. So in the below image, the blue path is a straight line (going diagonally across a 1x2 rectangle), and the red path is not (because it bends about a third of the way down).

• Pretty clear, but just to be 100%: "lines [are] paths on that structure" means that the lines run along the 3D surface, not through the 3D structure itself, yeah? So the blue line is "straight" on the unfolded mesh, not straight in 3D space and we don't need to consider lines leaving the surface. Aug 29, 2019 at 23:25
• @Alconja Yes, that's correct.
– Deusovi
Aug 29, 2019 at 23:30