Instruction:

This is a test of your ability to see a drawing on a flat paper as if it had the third dimension of depth. 

In this test, you will see a pile of bricks with some bricks labelled A, B, C, etc. Your task is to count the number of bricks that are touching bricks of the pile that has a letter on it. All bricks are of same size and shape.

Example:

Practice:

(Source: RDSO)