This calculator requires the use of Javascript enabled and capable browsers. This calculator is a knockoff simulation of the (still) popular arcade and lounge game of the 70s, Space Invaders. This game uses the appearance of numbers in the text box to develop the hand eye coordination of seeing a number and then typing that number to eliminate it. Try using the 10-KEY pad without looking at it. The high score is saved in a cookie. Numbers enter from the right and move to the left in both the text box and on the status bar line. It is up to you to save the Earth. Enjoy!