Instructions:

In each item of this test, you will see a pile of blocks. Each block is of the same shape and size. Your task is to count the number of blocks, having all sides and corners hidden by the other blocks. Please remember that there are always three blocks in the base of the farthest row.

Example:

In this example, 2 blocks are completely hidden by other blocks, as none of their sides or corners is visible. Therefore, the answer to this problem would be 2.

Practice:

Here are some Practice Problems:

The answer to Practice Problem 1 and 2 are 4 and 3, respectively. Indicate your answers by clicking the mouse.