Math plus and minus training, Suitable for all ages, Play anywhere and any time.Features • Covering elementary level lessons • Can play plus, minus, And can play plus and minus at the same time • You can choose difficulty levels ◦ Easy: has 3 choices to choose for the answer ◦ Normal: the player needs to type their own answers • You can customize game rule ◦ You can select the minimum and maximum numbers ◦ Choose to finish the game immediately when the player answers incorrectly ◦ You can choose the total question to played ◦ You can set the game time in each round ◦ You can play an endless game • You can check the answer after the game end, To check how you make mistakes • There are various statistics collected. Can view and check your stats at any time • You can change the input type to "Left to Right" or "Right to Left" • Has Carry and Borrow number systems