One board, the same for everyone in the world, generated fresh at midnight UTC. The size ramps through the week: Beginner on Monday and Tuesday, Intermediate Wednesday through Friday, Expert on the weekend, so the challenge grows as the week does. You can retry the same board as many times as you like within the day — a loss shows you the exposed board and lets you try again from the same opening, so it never burns your only shot. Clear it on your first attempt and you earn a first-try badge alongside your time; any later attempt still counts as a win, just without the badge. Your streak counts the days you've won in a row, on any board size; miss a day entirely and it resets to zero. New to the rules? See how minesweeper works.