Section 4: Gameplay & Modes
Why People Get This Wrong
People often assume that clicking a number square immediately uncovers all its flagged neighbors if it matches the flag count correctly. However, they misunderstand that until you've confirmed by checking each neighbor individually, you can't be sure of their status and risk misplacing a crucial flag. This rule's subtlety is what frequently leads to arguments in expert Minesweeper gameplay.
Official Verdict
Clicking a satisfied number — one with the correct count of flags around it — uncovers all its remaining neighbours at once. This is where most of the speed in expert play comes from, and misplacing a flag beforehand makes it instantly fatal.