If you're old enough to remember those Atari games, then you might remember how it started flickering every time too many objects were visible on the screen at once. Flicker plays on this interesting little quirk. In the game, you are a religious fanatic that's bent in destroying the entire human race. So, you travel back in time in order to carry out this deed. The game certainly takes advantage of this little screen flickering glitch and puts it to great use. It provides a whole new level of challenge while playing the game. Give it a try.