StarFox (SNES Cheats)
Fly through all the arches at the beginning of the first stage (any level of difficulty), and a Twin Blaster will appear a short distance ahead of you, under the last arch.
Whenever you see a roughly circular formation of rocks or other objects, you can generally cause a powerup to appear by flying through the space in the center of them. It doesn't seem to matter if you accidentally destroy some of the objects, so long as you fly through the area that was originally surrounded by them.
THE WHALE -- Appears if you do not shoot any Blue Sting Rays. It will appear on the Amoeba level of Path 2, the one that ends in the spinning boss with the long arms. (The stage right before Venom.) It appears just before you reach the boss, and drops enough powerups that you reach the boss with full energy, a shield, double twin blasters, and 5 nova bombs.
How to reach the Black Hole - About halfway through the Asteroid Belt (Lvl 1, Area 2), you'll start running into 'strings' of 5 asteroids, where the center one is orange (destroyable). Fly towards the center rock of each of these 'strings', and then destroy it just before you collide with it. After three of these, watch very carefully for a gray asteroid that has a strange 'face' on it. It'll show up almost immediately, so keep a careful eye on any normal-seeming asteroids that turn up. Fly directly into this asteroid. (You can shoot it first, if your shields can't take the collision.) You'll get a brief visual effect, then be dropped back to the map screen. Your ship will be repositioned at 'The Awesome Black Hole'.
How to reach Out Of This Dimension - Play on Path 3, the hardest one. Finish the first area by defeating the Ground Carrier. In the second area (Asteroid Belt), fly along, doing the usual things (destroying ships and rocks) until you see a large asteroid approaching on the left or left-middle of the screen. This is your cue to start watching for another large asteroid that approaches on the *right* of the screen. When this one on the right shows up, start shooting it, as fast as you can. If you pump enough firepower into it, it'll break open just before it passes you, and it will spit out an egg. The egg will float off into the distance (I usually try to shoot it, this may or may not be vital.), and then will hatch into a bird.
The bird will slowly make its way towards you. When it gets pretty close, start trying to keep it in your cross-hairs. (I do this from the Cockpit view, but I don't know if it matters.) Fly into it when it gets close -- try to hit it around its chest level. I decelerated so I'd have a better chance of catching it.
If it goes past you, crash into rocks to die, and try it again with your next ship. It takes less than a minute to reach the bird's location from the start of the Asteroid Belt, so this isn't too annoying.
If you hit it correctly, the screen will go weird on you, and you'll be dropped back to the Map Screen. Your ship will be moved to a small galaxy-shaped thing that wasn't visible before.
Congratulations. You're now in "Out of this Dimension".
It's a fairly easy area, but there don't seem to be any powerups of any kind. Just pieces of 'paper' floating around that fold themselves into paper airplanes and missiles and then come after you. Destroy them for a while, and you'll get the "incoming enemy" message and sound effect.
A giant jackpot machine will fly in. It has no energy bar. The only way past it seems to be by getting "7 7 7" on its wheels. Sometimes the buttons under the windows will light after a spin. Shooting the button will keep the wheel above it from spinning on your next pull of the lever. (You pull the lever by shooting it.) Unfortunately, I can't figure out what lights the buttons, and you can't shoot them unless they're lit, so you can't save your 7's unless they're lit. (There's also a demon-faced thing that can come up when you spin -- if any of them come up, the jackpot machine flips over and spits out lasers and missiles a couple of times. A friend threw a Nova Bomb at the machine while it was spinning, and it come up demon-demon-demon. Coincidence? Dunno. But it shot at him a lot more than it normally does.)
Any spin that contains a cherry is a "win", and the machine flips over and spits out orange and gray coins. If you fly through them, they replenish your shields. I'm not sure if there's a difference between them. These "wins" prevent you from saving any of the current wheels.
If you get "7 7 7" (I got lucky and got it on a random spin), the machine spits out a bunch of coins and then blows up. You get the usual sound effects from destroying a boss, and then some credits roll. (This is the normal credits sequence from winning the game.) You can fly around trying to dodge the credits, but it seems not to really do anything. Later, the letters "THE END" will show up, in various colors and positions. Shooting them makes them fly away and come back in a different orientation and/or color. If you get them all orange and right-side-up, they all fly away and come back again. There seems to be no real point to it. It kept on doing this til I got killed by the ships that fly around at the same time, then gave me the normal death sequence and "game over".
Rumor has it there may be something secret here if you shoot the letters of 'Game Over' in the proper sequence.
