In the original Super Mario Bros, if you get to Bowser while you're Super or Fiery, and you time it so that you hit the axe and Bowser at the same time, you'll hear the noise like you've gotten hit and shrunk, but you stay Super Sized.

Then, the next powerup block you hit will contain a mushroom, even though you already are Super. Collect it, and Mario turns small.

The next powerup block after that will have a fireflower in it (assuming you didn't get hit).

Collect that and Mario will turn Fiery, even though he's still small.

Shooting a fireball will make Mario's torso briefly turn big, but his feet will stay small if he's moving, which looks kind of silly.

A drawback to this is that you can't break any blocks while in this small-yet-fiery state. You'll have to get hit to revert back to Super Mario to do that. And if you get hit while Super, you lose a life.

But then the glitch resets itself, so you'll have to do it again should you want to.

A Boy and His Blob consists of two parts: wandering around caves collecting treasure, and wandering around an alien planet trying to avoid killer candy and treats. You can go to the planet pretty well any time you want to, but if you haven't gotten the bonus bag of jellybeans from the cave network you don't have the necessary items to finish the game. Tricky.

The problem with the Blob's home planet, though, is that everything's super-deadly and real tough to avoid, mainly because of the boy's particularly loose controls.

But he has a secret weapon.

On the first screen when you land on Blobolonia, start chucking jellybeans toward the left side of the screen.

It's kind of hard to get the timing right, but you kind of want to throw the bean right when you touch the edge of the screen. If you do it right, you'll briefly catch a glimpse off the last boss room. Once that happens, all of the enemies on the entire planet (except for the boss himself) will vanish.

Which makes that part pretty much as easy as it can be.

For such a small, short game, Double Dragon sure has its share of glitches and oddities.

Like this drum in Mission 1.

If you pick it up

Walk over to the nearest building (before it's been scrolled off the screen) and walk diagonally-up-right at the corner, you kind of go 'inside' it.

Once there, toss your drum and behold!

It glitches out and flies up and off the screen, possibly into space.

Too bad that's the only drum in the whole game.

In the NES version of Double Dragon, you have this weird Heart System to deal with that earns your moves. Essentially, as you beat up bad guys you get heart points, get 1000 heart points and you get another heart and another fighting move.

It's kind of tedious to earn moves this way, I'd much rather have all my moves up front for maximum face-smashing potential.

So, to speed the process along, go to Mission 2, right past the big pit. Go just far enough to make the two Williams appear. Let the top one get to about the end of the girders in the background and then hop back on the fence, they'll freeze in place.

Go all the way back to the left as far as you can. You don't have to fall off the ledge like I did here, but I think Billy's face is pretty funny if you do.

Then go back to where the upper William was and start attacking. You'll hit him over and over again, even though he's not there.

Keep going until you have 7 hearts, the maximum.

Then you'll have your entire martial arts toolbox available to use.

Good luck!

In the second board of Donkey Kong Jr. you come across some handholds that look different than the rest of the vines you've seen thus far.

They move left and right

and you have to make your monkey grab the left one and then gracefully transfer to the stationary vines on the far left.

So you reach out...

But, if you try to press 'Up' to start climbing instead of 'Left' to transfer over...

Junior's graphics kind of freak out. He's still playable and everything, and if you move him back into position, he goes back to normal.

I just think it's pretty interesting to see.

Oh, and it does not work on the arcade version of this game, so don't bother.

The Goombas in the original Super Mario Bros. games have kind of a rough existence. All they can do is walk slowly toward Mario in a not very menacing way. Even rougher is that there's a glitch (or maybe it's a feature?) that lets you kill them twice. This is actually kind of tough to pull off.

First, find a place where there's a koopa in a shell, something for it to ricochet off of, and some Goombas. Like in World 3-2, for example.

What you have to do is kick the shell away from you, then quickly start stomping Goombas.

On its way back stomp some Goombas, and if the shell collides with one of the flattened Goombas, it'll get killed again. Brutal!

To explain it a little better, I've created a short animated .gif here to show it in action.

Man, sucks to be those guys.