Download Number Invaders – Add
Number Invaders - Add features an interesting gaming concept in which you will be required to shoot numbers instead of alien space ships. The gameplay is still similar to Space Invaders where the enemies came down from above and tried to shoot you while approaching.
You will receive a calculus problem at the top of the screen and in the bunch of numbers you will have to find the correct answer and shoot it down in order to progress to the next one. The game is pretty easy but its difficulty can range depending on the settings that you choose for the calculus.