Sunday, 4 May 2025

Freddie Hand

The Penrose grid was recently released on Penpa+. Some of the grid shapes are weird. You won't believe what an order 4 tiling looks like!

As per GAPP tradition, here is a Nurikabe on this geometry.

Rules: Shade some cells so that all shaded cells form one edge-connected area. Clues cannot be shaded, and every edge-connected area of unshaded cells contains exactly one clue, the value of which represents the size of the area. No internal vertex (a vertex that is not on the border of the grid) can be entirely surrounded by shaded cells. ? clues can represent any positive integer.

Here's the last standard-shaped Nurikabe in GAPP, by Lavaloid: Archive: Thursday, 14 March 2024

Note: Some examples of forbidden shapes are attached. The penrose grid is highly irregular so it would be hard/unhelpful to show them all.

Acquire a Speedy Sloth 🦥 by solving the puzzle in 1:30 or less!
Obtain a Quick Crab 🦀 by solving the puzzle in 3:00 or less!
And all solvers who complete the puzzle will be rewarded with an Aperiodic Apostlebird 🐦

Example (Penpa+): https://tinyurl.com/2bv86cl6
Puzzle (Penpa+): https://tinyurl.com/2xwbwuj3