Block counting

Count every cube in a stack, including the ones hidden behind and underneath the ones you can see. Nothing floats, so a cube you can see is resting on a full column.

No time limit. Every answer is within two of the truth, so you have to count.

Count the cubes, hidden ones too.

A stack of cubes appears. Count every cube in it, including the ones hidden behind or underneath the ones you can see. Nothing floats here, so any cube you can see is resting on a full column of cubes below it.

How to play

Each figure is a pile of identical cubes seen from one corner. Count how many cubes it is made of.

Some cubes are hidden behind or below the ones you can see. They still count.

Nothing floats. If you can see the top of a cube, there is a solid column of cubes underneath it all the way to the ground. That is what lets you work out what you cannot see.

Count by columns rather than by faces. Work out how tall each column is, then add them up.

The four answers are always within two of the truth, so guessing by eye does not work. There is no time limit.

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