Count Cubes 3D. makes brain up

Please count the number of cubes in 15 seconds! It is a problem of the type in question, such as intelligence test of elementary and junior high school students. Stereoscopic. Arithmetic. Mental arithmetic. Reflexes. It becomes the practice to train the ability of such. Clear each level the percentage of correct answers. Level 1 80%. Level 2 80%. Level 3 80%. Level 4 80%.