Go to the difficulty selection screen then press RIGHT repeatedly until "Very Hard" appears.

Enter your name as ICHEAT then start a new game. While playing, press C-Down, Up, Right, Right, C-Right, A, Left.

Enter your name as ICHEAT then start a new game. While playing, press C-Down, C-Up, Up, Z, Z, Left, C-Right.

Enter your name as ICHEAT then start a new game. While playing, press A, Right, C-Down, C-Right, C-Up, A, Left.

Enter your name as ICHEAT then start a new game. While playing, press Left, A, Right, Down to give the aliens fat legs.

Enter your name as ICHEAT then start a new game. While playing, press C-Down, Up, Z, Z, C-Right, Right.

This code makes a mutant alien appear. Normally the harvester alien would have to eat 6 or more people to have a mutant alien appear, but with this code all you have to do is type in the code while battling a harvester alien and it will say "mutant cheat" and you'll see a mutant alien. If you kill it, you get 1500 points and you're saving 6 people.

WATCH OUT! The mutant alien will try to smash you so keep running from it!

The first alien artifact in the Java level is in Java 1. After recieving the boat parts while you are on your way back the "rat free" villiage, there is a long grassy path on the left where there was an alien warrior. This leads up to an old man's house with the alien artifact inside.

The second artifact can be found after you access the Black Harbour military base. Get on any flying machine and fly back to java 3. To the far east, right along the force field there is a landing area with other planes and a shanty housing the artifact.

The final artifact is found on the flight south to the processor. On the west side about halfway there, there is a runway and a building with the artifat inside.

Enter your name as ICHEAT then start the game. While playing, press A, C-Up, C-Up, Up+Left to launch a smart bomb. The bomb will destroy all minor enemies, shield generators and processors on the screen.

Enter ICHEAT as a name. Then, press Down, Up, Right, A, B, Left, C-Right during game play.

Enter ICHEAT as a name. Then, press Up, C-Down, C-Right, Z, Up, Left during game play.

Enter ICHEAT as a name. Then, press B, Left, C-Right, C-Right, Down during game play.

Enter ICHEAT as a name. Then, press C-Left, C-Right, A, C-Down, C-Right, Left during game play.

Enter ICHEAT as a name. Then, press B, A, C-Up, A, C-Up, A during game play.

Enter ICHEAT as a name. Then, press Down, C-Left, A, Right, Z during game play.

Enter ICHEAT as your name. Then, press Z, C-Right, C-Right, B, Left, C-Right during game play.

Enter ICHEAT as your name. Then, press Down, Up, C-Up, Down, C-Right, C-Right during game play.

To get the Hangar key perform the following:

• Get the TNT out of the tunnel and go to the big boulder.
• Blow it up. Then go straight until you get to the hill on the right.
• Go up the hill and go in the house on the top.
• Go inside and talk to the guy. He'll tell you if you that if you find the key you can have it.
• Go to the dresser and press A. You'll bang on it and it will open up to reveal the key.

In the first level there is a mountain with a chest of dynamite. As you use up your supply you can go back again and again to get more. The maximum you can get is three.