In Super Mario Bros. 3, every time you score 80,000 points, you get to play the card matching game

Ignoring the grammar error, you are presented with a grid of 18 cards and have to try to match pairs of cards to get the powerups they contain.

If you fail twice, you have to stop and try again when you get another 80,000 points. But! The layouts aren't random. There are eight possible ways that they could be laid out.

And maybe you have a better memory than I do, but I can't remember eight layouts of 18 cards each. Sure, you could write them down, but then you'd have to make sure that you had your notes handy every time you played, which might be OK.

But, take a closer look at the second picture. Notice how the last 3 cards in the bottom row are Mushroom, Fire Flower, Starman? It turns out that those three cards are the same cards in the same order on all eight of the variations! Making it really easy to remember at least the three of them.

In the 'grassy' stages of Super Mario Bros. 3 (like stage 1-2, for example) you might notice that there's a dark green patch at the bottom of the screen.

You may be thinking that was an artistic choice, but if you're properly prepared, you'll find that it's more than that.

Enter one of those stages with a P-Wing equipped and fly down the closest pit (being careful to not actually fall in, of course) and you'll find that the dark green stuff is actually a tunnel that runs most of the length of the stage!

Of course, stuff like enemy fireballs that go through the ground can still hit you if you're not careful, if you stop mashing the A button you'll fall off the bottom of the screen and lose a life, and you can't actually finish the stage from down there, you have to be above ground to hit the Card at the end.

But it's a fun novelty to do once or twice.