Young guy Jack works at a construction site on a crane. Today you in the game Builder will help him do his job and build a house. Before you on the screen you will see a stone foundation. A block will appear above it, which will move to the right or left at a certain speed. You will have to predict the moment when the block is exactly above the base and click on the screen with the mouse. If you calculated everything correctly, then your block will stand exactly on the ground. After that, the next item will appear and you will repeat these steps.