Counting

A number equal to its covered neighbours means all mines. A satisfied number means all safe.

Every number is a count of the mines touching it, and two things follow from that. If a number equals the covered cells around it, every one of them is a mine. If its mines are all accounted for, every covered cell it still touches is safe.

Drill 1 of 3

Flag every mine you can prove.

All drills

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