.. Elevator lock

Each button line in the grid follows a logic. There are two symbols, which of one is rotating when you move right on the line.

Each line you have one, two and three circles/points. Each line has one that is only points, one that is empty circle and one that is circle filled with the point.

This is a little trickier. This time we should look at the columns.

Think of it as subtractions or differences. The first and second combined will result in the symbol at the bottom.

Outer dots combined will add up. Inner dots and outer dots combiled will subtract.