Zombies Ate My Neighbors

Sound test:
Press L or R at the Lucas Arts logo.

When the opening short credits are displayed with the copyrights, etc., press R to hear a dog bark or L to hear a victim scream.
Information in this section was contributed by Japanime6651.

Bonus level:
Enter BCDF, GYLM, or XDSJ as a password.

View end credits:
Enter XWJR as a password.

Cheerleaders vs. The Monsters bonus level:
Enter WBGR as a password to begin game play on level 9 with all ten victims. Rescue all victims on each stage up until level 12 (Mars Needs Cheerleaders) to reach the "Cheerleaders vs. The Monsters" bonus level.
Information in this section was contributed by Elliot Bowers.

Hint: Best weapon:
On level 14, go as far right as possible and find the hidden passage on the wall. Go through and you will find a shotgun.
Information in this section was contributed by pdb.

Hint: Level 1: Bonus level:
If you are lucky enough to get a bazooka cannon, use it on the bushes next to the house to find a bonus level. Note: You must have all 10 victims at the time. You must save all 10 cheerleaders without any dying to automatically be sent to a bonus level after the level is over.
Information in this section was contributed by qbmattss.

Hint: Level 9: Bonus level:
If you have a bazooka cannon, use it on the bushes near the top of the area to find a bonus level. Note: You must have all 10 victims at the time. You must save all 10 cheerleaders without any dying to automatically be sent to a bonus level after the level is over.
Information in this section was contributed by qbmattss.

Hint: Monster Phobia level: Giant spider:
At the very end of the level is a Giant Spider. You normally must defeat it, but it will take almost everything you have. It is best just to pass it by with a level skip password. Note: If you do intend of fighting it, use the weed wacker to cut through the webs that it makes.
Information in this section was contributed by Japanime6651.