To start the game, wait for it to load and then click Play. You need to find 6 differences for 100 seconds. When will cope with the task - can move to a new level button ( Next Level), to begin to look for the differences between the next pair of images.
For each found the difference you get 100 points. For the error (click in place on the picture where there are no differences with the other picture) from your account is deducted 5 points.
If you deal with the problem quickly, you get bonus extra seconds to solve the following problem. If you have difficulty with the solution of the problem, from time to time you are given a hint (there is a button Hint)!