Mega Man X4 Cheats for the PS

To play as Dark Mega Man:
Go to the Character Select screen. Highlight X as your character. Press O, O, press Left 6 times, hold down L1 and R2, then press X. You should start off with a somewhat purplish tint to your armor. Now go to any Dr. Light capsule to receive the super armor. This lets you do unlimited giga attacks.

To Play as Dark Zero:
Highlight Zero then hold L1 and press Right six times then hold Circle and press Start.

Hints

Boss            Weakness
Web Spider:     Twin Slasher (cut the web he's hanging from)
Cyber Peacock:  Soul Body
Storm Owl:      Aiming Laser
Magma Dragoon:  Double Cyclone
Jet Stingray:   Frost Tower
Spilt Mushroom: Lightning Web
Slash Beast:    Ground Hunter
Frost Walrus:   Rising Fire
Double:         X-Buster
Colonel:        X-Buster
General:        X-Buster
Sigma:          X-Buster

Find all the Sub-Tanks:
Cyber Peacock: Stage 1, get S rank on sector 2 to get the life sub-tank.

Marine Base: Stage 2, at the last track, do a full jump. Then when you hit the disconnected track tap X, and then press O to obtain the life sub-tank.

Snow Base: Stage 2, after you get through all the ice blocks, there should be another set higher on the platform. Keep on hitting it to obtain the weapon sub-t.

Locate all the Hearts:
Jungle: Stage 2, use rising fire on one of the full tree trunks.

Cyber Space: Stage 1, Area 1, Get rank S.

Flying Fortress: Stage 1, get the heart before the laser destroys the platform.

Volcano: Stage 2, speed jump over to the ledge were the balls of fire start raining down.

Ocean Fortress: Stage 1, don't jump into the things that shoot, fall down to get the heart.

Bio Labrotory: Stage 2, Move past the first drills, jump back, use lightning web as wall.

Military Train: Stage 2, Use Ridden to smash open one of the cars.

Ice stage: Stage 1, use rising fire to melt the ice block.

Game Shark Codes

80172204 0002 Infinite Lives

Thanks to Revolution readers Philip Monroy, Drew Ferren, Ben Brogren, Tim Rogers, Michael Mallard, Patrick and Adrian Tepes!