The final step in extracting crystals from the mine is overcoming obstacles and solving math operations from the addition and subtraction pools. This time, the available answers will contain numbers with different signs. This task is not the easiest one, but the effort is compensated by the reward – a car full of crystals! When choosing an answer, pay close attention to the sign next to the number, do not get confused! As in “Adding” and “Subtracting”, answers should be selected by touching them with your hand or foot. If the answer is incorrect, the number that was created after the action was performed will be displayed in the lower right corner.