Show HN: Cubisum – A Number Puzzle Game

Hi HN,

I'd like to share a logic number puzzle game that I've been working on. Cubisum ("Cubism" + "sum") draws inspiration from Sudoku and Minesweeper, while also creating compositions reminiscent of Piet Mondrian's cubist work. The rules are simple, but I found it a surprising challenge (It was much harder to estimate the difficulty before I saw an actual game board). I hope you enjoy it -- any feedback would be much appreciated!