At the level select screen with the globe, highlight Russia and press Right. Hold X + Down/Left before the Japanese mission details appear. The globe will begin to bounce through the levels. To choose a level, release the buttons when the desired level is selected.

True ending

On the final level (Japan), when the shield generator is blown up, walk into the center of the explosion for a hidden level and the true ending of the game.

Game Shark Codes

Infinite Shields	800C4CD0 0064 800C4CD4 0064 800C4CD8 0032 800C4CDC 0032 800C4CE0 0032 800C4CE4 0032 800C4CE8 0032 800C4CEC 0064
Infinite 50mm	8008D1A4 012C
Infinite Labor	8008D1A8 00FA
Infinite Plasma	8008D1AC 003C
Infinite Cannon	8008D1B0 0046
Infinite Missiles	8008D1D4 000A 8008D1DC 000A
Inifnite Hyena Missiles	8008D1D8 000A
Infinite Cerebus Missiles	8008D1E0 000A 8008D1E4 000A 8008D1E8 000A
Infinite Scythe	8008D1B4 0009
Infinite Vortex Bombs	8008D1B8 0009
Infinite ULF Pulse	8008D1BC 0009
Infinite EM Pulse	8008D1C0 0009
Infinite Kraken	8008D1C4 0009
Infinite Medusa	8008D1C8 0009
Max Energy Cores	80089670 00D0
Cannon Coolant	800D1C6C 0000
Freeze Timer	800C4CF2 0009
Never Overheat	800D1CB8 0000

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OK, so there are 3 guys, and they are walking down the beach, when they find an old barnacle-encrusted bottle laying on the shore. One of the guys, says
"Hey look. Its a bottle hehe", and he picks it up and throws it. It cracks against a nearby palm tree, and a blinding flash of white light engulfs them. A deep voice says
"I am a Genie. I have been trapped in that bottle for over a millenium. You have freed me and it is all I can do to give you each 1 wish. Of anything you desire."
So the first guy is pretty bewlidered, but he thinks (something he has not done in quite a while)
and says...
"uhhh... I wanna be 2 times smarter yup..."
so the genie grants his wish and he becomes two times smarter, and begins to recite the multiplication tables.
The genie turns to the other guy, who was slightly smarter than the first one, and asks him what he wants. The man replies,
"Well, I don't want to be stupider than HE is, so let me be 10 times smarter."
The genie grants his wish and he suddenly is able to recite any word out of the dictionary, and can practically do anything!
The genie turns to the last guy and asks HIM what his wish is. The guy thinks hard for a moment, and the perfect wish comes to him.
He says proudly, "I want to be 100 times smarter than I am now."
The genie looks at him uncertainly, and tries to persuade him to wish for something else. The man gets angry, and says "MAKE ME 100 TIMES SMARTER!!!!!!"
the genie sighs, and promptly turns him into a woman.