Gex

Speed power-up:
Press P to pause game play. Then, hold RS and press Left, C, Down, Right, Up(3), Right(2).

Jump power-up:
Press P to pause game play. Then, hold RS and press Left, C, Down, Right, Up, B(2), Right(2).

Invincibility:
Press P to pause game play. Then, hold RS and press Left, C, Down, Up(2), C, Left, Right, A, Right.

Lightning power-up:
Press P to pause game play. Then, hold RS and press Left, C, Down, Right(2), Left.

Fireball power-up:
Press P to pause game play. Then, hold RS and press Left, C, Down, Right(2), Down, B, A, Left(2), Down.

Ice power-up:
Press P to pause game play. Then, hold RS and press Left, C, Down, B, Left, Up, Right, B, A, Left(2), Down.

99 lives:
Press P to pause game play. Then, hold RS and press Left, C, Down(2), Right, A, C, Up, Left, A.

All levels/worlds:
From the world or level map, press P to display the remote control bar. Then, hold RS and press Left, C, Down(2), P, Right(2), A, Down. Use this code from the central area with Rez's dome in the center to turn on the TVs and allow any world to be entered immediately. Use this code from within a world to turn on all TVs to allow any level in that world to be entered immediately.

Long ending:
Hold RS and press Left, C, Down, B, A, Down, Up, Right, Left, Down, B, Right, A, Right, Down at the title screen. The long ending of the game will be displayed, which includes sketches and graphics that were used during its development. This is the ending is normally seen only after the Planet X level has been completed.

Planet X level select and secret Boss:
Hold RS and press Left, C, Down, A, B, C, A, B, C, A, B, C(2), B, A at the title screen. The Planet X level select screen will be displayed. This allows the Planet X levels, plus the Planet X Boss level, to be played.

Planet X level translation:
0:SCIFI1 is Clothesline
1:SCIFI2 is The Web
2:SCIFI3 is Free Fall
3:SCIFI4 is Bombs Away
4:BONUS7 is Saucer Section
5:MAINMAPS (SCIFI) is the Planet X world screen. Press X to return.
6:SL67 is Newton's 4th Law
7:SL68 is The Project
8:SL69 is Head To Head
9:SL71 is the secret Planet X Boss level.

The Planet X Boss level was never intended to be in the game. One of the programmers was done early and decided to add an extra feature. The Planet X Boss level was the result, but was unfinished and left out of the game. The premise behind this scenario is that the Boss, a robot, tries to shoot Gex with a shrink ray. After a while, a green orb will fall from the ceiling. Gex will grow larger each time he eats the orb. If Gex can eat the orb three times without being shrunk, he will be large enough to defeat the robot. After the Boss is defeated, and the game is allowed to continue without pressing the D-pad, Gex will eat various objects that will appear on the screen.

Lost levels and level select:
From the world or level map, press P to display the remote control bar. Then, hold RS and press Left, C, Down, Left, Right(2), Up, Right(2). A level select screen will appear.

The Lost Levels
There are eight playable levels that were not included the game, and can only be accessed only from this screen.

5:GRAVE6 (Alternate version of Disco Inferno)
A level with a long river of slime that Gex must follow.

14:JUNGLE1 (Whip It)
The interior of a jungle temple, complete with arrow shooting idols.

17:JUNGLE4 (Also named Whip It)
A somewhat complete level (has music, but no sound effects) of an underground village with a lot of platforms and blowdart shooting opponents.

18:JUNGLE5 (Also named Whip It)
A short incomplete level composed entirely of flying platforms.

38:KUNGFU4 (Alternate version of Sumo City)
A level with many sloping walls and ninjas with throwing stars.

39:KUNGFU5 (Another alternate Sumo City)
A level filled with poisonous water, sinking columns, and rocket-powered TVs.

23:REZ3 (Untitled - Rezing Walls)
A screen displaying static will appear. Press A to continue. Walls and objects in this level materialize and de-materialize. Metallic shape-shifting blobs and Rez Knights are also present.

25:REZ5 (Untitled - Climb It)
A screen displaying static will appear. Press A to continue. A level with many moving platforms.

41:SECRET1 (Couch area in New Toonland)
An incomplete game section with giant couches, and an area that rains anvils and safes.

46:SECRET5 (Introduction to the lost levels)
A screen displaying static will appear. Press A to continue. Tail whip the question mark for a list of the lost levels. Kill Gex to return to the map.

Debug mode:
Press P to pause game play. Then, hold RS and press Left, C, Down, Left, Right, A, Down, Right, Left. This code resets with each level.

Hold X and move the D-pad to travel around the current level.
Press X, P to kill Gex.
Press C on controller two to give Gex a power-up. Each press gives Gex the next power-up.
Hold B on controller two and use the D-pad to scale the screen larger or smaller while playing.
Hold B + C on controller two and use the D-pad to rotate the screen.
Press RS on controller two to show timing information.
Press RS(2) on controller two to add more information.
Press RS(3) on controller two to add collision boxes (difficult to view).
Press RS(4) on controller two to add contours.
Press RS(5) on controller two to add attributes.
Press RS(6) on controller two to resume normal play without parallax scrolling.
Press RS(7) on controller two to add more information.
Press RS(8) on controller two to add collision boxes (difficult to view).
Press RS(9) on controller two to add contours.
Press RS(10) on controller two to add attributes.
Press RS(11) on controller two to resume normal play without the tiles.
Press RS(12) on controller two to add more information.
Press RS(13) on controller two to add collision boxes (easier to view, when Gex is near object).
Press RS(14) on controller two to add contours.
Press RS(15) on controller two to add attributes.

When contours are viewed, press LS on controller two to display them thick.
When contours are viewed, press LS(2) on controller two to display them solid.
When contours are viewed, press LS(3) on controller two to display them normally.

Hold LS on controller two and use the D-pad to scale Gex. Note that as soon as Gex moves, the scaling will return to normal. To keep him scaled, use controller one to enter the following code: Press P to pause game play. Then, hold RS and press C, Down, Left, C, Down(2), C, A, Left, Right.

Hint: Higher jumps:
Use the super-spring to jump off enemies to reach otherwise inaccessible areas and items. Press LS to run up inclines and gain more momentum to get height on jumps.

Hint: Defeating the Toonville Boss:
Crawl on top of the ceiling. When he is below you, hit the anvil and it will fall on him.

Hint: Increasing your life paw:
Face a power-up that bounces. Crouch down and use the tail whip (press B) then use the tongue lash (press A). You must do this very quickly. This is a good way to increase your life paw. Note: Do the same thing if you have range in the air.
Information in this section was contributed by Knight.

Hint: Extra points:
To get more points, let the game play by itself. At any time, you may then start playing your game with the points that the CPU earned.
Information in this section was contributed by Knight.

Glitch: Save game bug:
The manual is incorrect when it states that the game will be saved after defeating each boss. The only way to save the game is to obtain a Video Tape.