Sweepr - Minesweeper Without Guessing

Every minesweeper ends the same way. You clear nine tenths of the board, you reach a corner where two cells are equally likely, you pick one, and the board takes it away from you. That is not a puzzle, that is a coin. Sweepr does not lay a board until it has proved you can finish it. Behind the first cell you open, a solver works the whole field out using only the reasoning a person uses: a number with as many covered neighbours as it has mines left flags them all, a number with none left opens them all, and where two numbers overlap, the difference between them settles cells neither could settle alone. If the solver ever has to guess, that layout is thrown away and another is laid. What you get is a board that rewards thinking and nothing else. WHAT IT DOES - Boards that are proved solvable by logic before you ever see them - Aim, then tap: the first tap puts a frame around a cell, wider than the cell, so it stays visible around your fingertip; the second tap opens it, holding it plants a flag - Works the same with buttons on watches with no touch screen - Three sizes, from a quick five by five to a nine by nine that takes real time - Tap a number that already has its flags to clear everything around it at once - Your board is written down after every move, so leaving the app never loses it - A hint that proves a cell is safe, and when nothing can be proved, it counts every legal arrangement of the remaining mines and tells you the safest cell and the odds - Best time and best efficiency per size, measured against 3BV, the fewest clicks a perfect player would need - A streak that counts the boards you cleared in a row - Five languages, on-watch settings, nothing sent anywhere WHAT IT NEEDS Nothing but the watch. No phone, no signal, no account.