Use your binary and math skills to guess the number using the tiles and operators on the board. 2 n Sum is based on binary code and numbers on base 2... 2^0, 2^1... 2^3.... 2^n... get it? 2 n Sum !!! Each time you switch a tile between 0 and 1 the numbers on the left side will update accordingly. Switching the operators from + to - or * will update the total sum field (green) according to the numbers above it. The timer starts counting down from 90 seconds and you need to guess as many numbers as you can to beat your high score and your friends... You also get an additional 3 seconds in 2 n Sum for each correct guess. Every time you guess a number, 2 n Sum will added to the current score so the more numbers you guess, the more points you will get... But remember you have to do this before the time runs out. 2 n Sum, welcome to our world!!!