Rules
Variant of Cave:
- Draw a single loop along the dashed lines that encloses some cells. Edges of this loop may not cross or share a vertex.
- Numbers indicate the number of connected cells from all lines of sight radiating from that cell, including the cell itself. Numbers can be inside or outside of the loop. Lines of sight end on either the edge of the grid, the center of a triangular cell, or the edge of the loop.
Example
Puzzles
All of the puzzles can be found organized in this printable PDF, or in the images below.
PDF Karst
01. Medium
02. Hard
03. Hard
Paramesis Puzzle Blog 
In the example, shouldn’t the 5 in top-middle be 6?
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Yes it should. The example has been corrected.
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Last solution has multiple solutions, I think (see image). Changing the 10 to an 11 should fix this.
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Even with 3 test solves, mistakes can still get through. It looks like I miscounted one of the sums. In my solution the upper left 4 in the 444 should have actually been a 6, but I like this result and solve path better. I changed the 10 to 11.
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Thanks, really enjoyed this variant and these puzzles. I kept making mistakes seeing/counting the triangles around numbered hexagons..
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Me too… I’m glad you enjoyed them.
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