When you're playing the Game Boy version of Teenage Mutant Ninja Turtles, you'll occasionally run across a bonus game where you have to overcome a challenge in order to regain health. One of these games is a number-guessing game where you have to correctly identify a three-digit number in ten tries.
You do get some help, though. Splinter will give you feedback to try and steer you toward the correct number.
But, the hints don't really seem to be worth a whole lot, do they? I mean, I can't exactly put in a number that's smaller than 000. Turns out that he's telling you that the number that you put in is bigger or smaller than the one he's thinking of... which doesn't make a whole lot of sense to me. But once you know how to actually play the thing, the game becomes quite winnable.