My first Nikoli puzzle book was Pencil Puzzle Yajilin 1, back in 2006 when the Pencil Puzzle series was available. Yajilin has always been a special puzzle type for me. It marks the beginning of that unscratchable itch that I think most puzzlers have, to relentlessly explore new puzzle types and variations and to engage with problems for which no well-trodden inventory of techniques already exists. I’m happy to return from my break with a Yajilin variation on a new tiling [33434; 3262; 3446; 63].
EDIT: Following a suggestion from edderiofer, I have made the clue cells easier to distinguish.
Shade some cells and draw a loop in remaining cells such that:
- Every empty cell is either shaded or part of a single loop that does not branch or intersect.
- Numbers in some cells indicate the total number of shaded cells that can be seen in all directions from that cell. Lines of sight run perpendicular to the edges of a cell and terminate on the edge of the grid or at a triangular cell, counting that cell.
All of the puzzles can be found organized in this printable PDF, or in the images below.