Welcome to our gym, where you will train not the muscles, but the gyrus of your brain. There are steel rods on the field, on which you need to string metal donuts of different weights. They are served at the bottom in two pieces, put them on the rods, combining two of the same to get a heavier donut. The task is to fill the scale at the top of the screen. You need to try not to overflow the columns, keep them low and then you will have room to maneuver. Black donuts destroy everything you put in a column, they can be used when you have almost reached the top. Each level is more difficult than the previous one, the tasks become more difficult for you to train your wit and logical thinking in the game Gym Stack.