You can see on this live implementation that it's not a great system in practice: http://www.mmhp.net/Passwords/MM2/ http://www.mmhp.net/Passwords/MM2/ Check

You can see on this live implementation that it's not a great system in practice: http://www.mmhp.net/Passwords/MM2/ http://www.mmhp.net/Passwords/MM2/ Check boxes and see how the pattern changes, which is like how we wrote down the codes when we were kids after we beat a boss. It's easy to see that generally only the position of one red dot changes after each level. So it makes it very easy to brute force more options. Not hacking the system properly, but enough so that you could get past levels you were stuck on.