A classic logic challenge, Rullo tests simple Math knowledge on sum and subtraction. However, much more complex connections should be done. Each row has a number on its sides, both left and right or up and down. The sum of all the other numbers in the line should equal them. Once all the lines are matching their starting sums, the level ends. In the classic mode, the player conquers a level and is able to pick a harder one. It's possible, though, to also use the Mouse to play the endless mode. Choose one and take the right decisions in-game.