[jaffa2]

it is possible in normal mine sweeper to have a postion where you cant determine 100% whether a square is a mine or not. In this cases you just have to guess. Try to identify them early as possible since they can ruin the game with an unlucky guess.

[Retr0id]

It is also possible to implement minesweeper such that all positions are solvable unambiguously, see https://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/mine...

[pompomsheep]

Yes this was possible in minesweeper but something I tried to eliminate in sunflowers. You never have to guess even at the hardest difficulty levels