Addition pyramid game with Einstein, in which you have to fill in the gaps in the pyramid with the correct number so that the two numbers at the base add up to the number above them. So you have to add and subtract and check to find the missing number in each square of the mathematical pyramid. To solve the pyramid you will have to practise addition and subtraction, i.e. inverse addition, reasoning logically to find out the values of the unknowns. Two numbers that are in consecutive cells, in the same row, have to add the number in the top cell of both cells. See other mathematical pyramid games.