MemoMath

The game has 2 mode: Quick play and Career. Quick play initialize the game by the difficulty settings.
Very easy: You have 12 seconds at start to memorise the cards, and 3 chance to show cards. Just Sum operation.
Easy: You have 8 seconds at start to memorise the cards, and 2 chance to show cards. Just Sum operation.
Moderate: You have 5 seconds at start to memorise the cards, and 1 chance to show cards. Just Sum operation.
Hard: You have 8 seconds at start to memorise the cards, and 1 chance to show cards. Sum and substraction operation.
Very Hard: You have 6 seconds at start to memorise the cards, and no chance to show cards. Sum and substraction operation.

Career: At start you have 40 tries to solve the tasks and 5 chance to show all cards.
Every completed level gives 10 new tries. If you complete the level without mistake you get 3, maximum 5 mistake will gives you 2, maximum 10 mistake will give you 1 bonus oppertunity to show cards.
At start you have 10 seconds to memorise cards, then you will have 85% of time by level to memorise the cards.
The game over, when you don't have any try.