Put in a number and it will plus all the numbers from one to that number together. For example, if you put in '6' it will add 1 + 2 + 3 + 4 + 5 + 6 = 21. You can put in any number, no matter how high. Literally. When it says the answer, tap the screen to put in another number. The longer the number, the longer processing time. Try to choose a number that is 9 digits or under to be quick duh.
me (this is not a remix so if you see someone make this before i did that is a coincidence) and this took me 1.5 days straight to do this.