A guess is the moment you run out of numbers to read — two hidden cells, one mine between them, nothing that tells them apart. It shows up two ways: a straight 50/50, where the odds are the best information you have, and the unreachable corner, where a section of the board is walled off with no revealed number ever touching it, so it can't be deduced at all. Both are the board's fault, not yours.
Classic minesweeper places its mines first and reveals your first click second, with no check in between. Most of the time that's fine — but often enough to be frustrating, the random layout leaves a genuine 50/50 or an unreachable pocket, and no sequence of moves would ever have solved it by logic.
Every board here is generated, then checked before you ever see it: a solver works through it cell by cell, using only the deductions you would, starting from the opening move. If it can't finish the board using logic alone, that board is thrown out and another takes its place. What reaches your screen has already been proven solvable from the first click to the last cell.
No-guess doesn't mean easy. You can still lose — a wrong flag, a rushed click, a chord fired too soon. The logic is always there to find; finding it fast is still the entire game. It means that when you do lose, it was a mistake, never a coin flip you were owed.
No-guess boards are the default here, on every difficulty. Prefer classic randomness instead? Turn the "No-guess boards" toggle off in settings. Try it on Beginner, Intermediate, or Expert.