When you need a break, save your position - you'll be able to continue from that point later on. Cheops' pyramid adventure is even more engrossing. The plot is more complex and mathematics is more advanced. Exercises include fractions, word problems, trigonometry, quadratic equations, functions, the binary system, Pythagoras' theorem, approximate calculations. In the corridors of the pyramid lurks the spirit of the Pharaoh hindering your advance with questions that may require a visit to a library.
Some mathematics is quite ingenious.
I was taken by the task of controling an elevator with a damaged calculator in which more than half of the buttons were out of order. Be ready to watch a world class soccer game. Rewards differ from level to level. On the fourth level, you collect hellicopter blades to wisk you through the opening at the top of the pyramid. If you make too many mistakes solving a task, you may lose some of the rewards, but you can always win them back by taking up the task again.