I'm a part of a game jam. I wanted to make a "harder" version of minesweeper. My idea is to build a version of minesweeper, where the value on a square is the number of mines it is touching + (the total number of mines all of it's neighbors are touching * 1/8).
Before I build it, I'm trying to figure out if this version of minesweeper is still beatable. I would consider it "beatable", if the odds of winning are similar to the original game (calculated here.