Cave (no 2x2)

WPC 2023 had some Cave variations, so I made this in preparation. The no 2x2 constraint is surprisingly finnicky in construction-- perhaps if I knew yin-yang theory, I could have spent less time trying to fix an impossible set of clues. Penpa link: https://tinyurl.com/ylozmfj4

Rules: Shade some cells in the grid. The numbers must be unshaded, and tell how many cells it sees horizontally/vertically (including itself!). All unshaded cells must be connected. All shaded cells must be connected to the outside of the grid. No 2x2 may be entirely unshaded or entirely shaded.


Comments

Post a Comment

Popular posts from this blog

WPC 2023: 13th place! And puzzle people are real!

Image
After solving and constructing logic puzzles for three years, I finally decided (and had the opportunity) to go to WPC (the puzzle part of the world sudoku+puzzle championship). It has been a wonderful and thrilling four days, and I aim to recap the incredible experience I had in this post. October 18, 2023 I took a taxi from Billy Bishop airport (with a terrific view of Canada's trees in autumn) to the hotel, and I immediately got to marking my nametag: I found many Puzzlers' club members at a large table. It was my first time meeting them all: djmathman (David Altizio) was super excited to see me, and I was just as excited to see him and everybody else (Kevin Sun, Dan Katz, Thomas Luo, Tim Miller, Yuan Yao, Walker , Victor, and more). My roommate IHNN would arrive later. Tim and Dan were both on the USA B team like me, so I made sure to greet them well. People were practicing castle walls, and I heard tluo considering buying a GMPuzzles subscription for more math path pract
Read more

Yajilin (exercise)

Image
During WPC 2023, Craig and bakpao hosted a speed-setting contest in person. The prompt was to make a Yajilin variation. Here's the Yajilin (exercise) I came up with, which won 1st place! It's only slightly cursed. Penpa link:  https://tinyurl.com/ytfydo2d Rules: Shade some cells in the grid so that each arrow (yajilin clue) sees the indicated number of shaded cells. Some shaded cells are given. Shaded cells may be adjacent. Then treat the resulting grid as an Exercise puzzle. That is, draw a directed loop through cells which can push shaded cells into empty cells. A shaded cell can move exactly once in the direction it's pushed, and can only move once. Shaded cells can't push other shaded cells. The finished, traversed loop must pass through all empty cells in the grid. Note: The yajilin clues only care about the shaded cells before they've been pushed by the loop. I've been told the rules are confusing (what a surprise!), so here's an example: Below is th
Read more

#7, #82, #130 Country Roads

Image
Here are some Country Roads! Although, the last two really should be State Roads... #7  https://puzz.link/p?country/14/9/209lr5b58kalh4e5ap6vc50g55g5kumgiug3s0tk45gvsu0h38-11k94g3g33 #82 (Virginia) https://puzz.link/p?country/16/13/ag2ak28qidsams4ko2kg2r01g00gb4a34r9929803ucuvpoi160u484c80380i805vvujg0muv4g081g1g37g3-1d34h83l6227 #130 (Pennsylvania) https://puzz.link/p?country/18/13/54l1k3pamot90ng0dc01d00i803200mg0jd32csdna000tcd1l4b3rdt4vs2008801q007e004o06uvvsaedg9u90r-22j2j54g
Read more