#138 "Cornerstones" - Square Jam

A while ago I made a bunch of moderate-to-tricky puzzles of various genres in this grid size, thinking I might try to continue that. Square Jam's are super fun, I've made a few but haven't posted any here! Bout time that changes Divide the grid into square regions of orthogonally connected cells. A number indicates the side length of the square it’s in. Region borders may not form any four-way intersections

Solve on Penpa+

https://tinyurl.com/4reawvbb