At opening credits press L, Up, X, Up, R, Y. If you do this correctly an extra green line will appear at the bottom of the screen and a warning screen will appear. Just ignore it. Now enter A + Y for level select and then enter B + X for energy gain. To use level select at the beginning of a level, just press SELECT.
At the Virgin logo screen, press Up, Up, Up, B, B, Y, Y, Select, Up, Down, Left, Right, B, Up, Y, Left, Select, Down. If you did the trick right, you'll hear several tones. Now go to the Options screen, and you'll be able to access the Stage Select option.
Make Mowgli Fly
First, do the level select code. Now, select cheat 5. Then start the game. Hold down the top L button. Mowgli will be flying! (With any luck, you will beat the game in about 10 minutes.)
Pause the game and press Up (x3), Down (x10). L cycles weapons in one direction while R the other.
Dion Egg Hunt
D — This is the first letter in the name and also the hardest to find. It is hidden in a secret level which also has many power up's. Go to the Eastern Mountain Range, in the southeastern part of the mountain you should find a Secret Level. This level should look like the catacombs that link the raptor pen to the visitor's center. Go down the corridor adn turn to the right. You will find an aisle filled with weapon power-ups. Pick these items up and make another right into a corridor with indented walls on your left. Go up to this indentation and the walls open revealing the letter D. Also in this room is an one-up. You can keep on going in and out of the Secret Level to aquire an infinite arsenal and infinite lives
R — The R is found in the southwestern edge of the East Forest. Go to east end of the East Aqueduct and then head southeast to find the R.
H — Go to the top of the Visitor's Center and in the center you'll find the H.
O — Walk through Gate 2 and head northeast. Pass an exterior motion sensor, keep going north to the end of the path, the head east.
R — Directly south of the Nublar Utility Shed to find the second R.
N — When you've accessed the computer in Nedry's office, and can open the park's gates, go to the North Utility Shed. Go around to the northeast corner of the shed and go up the river. When you've went as far as you can you'll find the N.
E — At the Beach Utility Shed go southwest to find the E. Watch because after you've found the E the T-Rex will come after you from the west so be quick.
R — The last R is east of the Helipad. Go straigt east from the H on the Helipad until you find a Secret Path in the plants. When you're through, head north and you've completed the puzzle.
Extra Lives
Go to the big rock formation (a wedge of rocks where one is above and the other is to the left.) Search the far right corner until you find a hidden cave. Inside you'll find a cache of extra lives. Come back here whenever you're low of life.
