Kronn Hunter Mode

Shoot the first three humans you see without hitting anything else. When you hit the third human you will be taken into ''Kronn Hunter'' mode with messed up colors and a different ending sequence.

Contributed by: _LordAtomic_ 

Spooky Hidden Room

After riding through the air field and grabbing the ladder that's hanging from the helicopter, look closely for paintings hanging on the office walls. If you shoot all the paintings, and both office doors, a frightening, yet funny, room will be revealed.

Contributed by: Shirow 

Best ending

For the best ending, shoot off all the panels on the Mothership.

Contributed by: Shirow 

Hidden Credit

If you look through the game's files, you'll find one named VER.TXT. It contains a dev team credit, copyright notice, and build date.

Contributed by: discoinferno84 

Secret Rooms

* Level 2 (Hangar): Shoot out all of the upper windows along the far back wall in the Hangar in order to enter the 'Chow Palace'.
* Level 2 (Hangar): To enter the 'Egg-Cellent Room', make sure to shoot all of the yellow barrels while riding the forklift before you get to the parked trucks.
* Level 4 (Airport): Make sure that every yellow box is shot while riding the STAAR jeep to enter the 'X-Marks the spot room'.
* Level 5 (Office): Shoot the door-plate of the second door (marked General Weatherby) as the door is opening to access the 'Headquarters Room'.
* Level 7 (Abandoned Base): Shoot all of the yellow barrels at the first area where four purple zombies are throwing barrels on the hill, to access the 'Chow Palace' again.

Contributed by: red_daysleeper 

Kronn Hunter Mode

Shoot the first three humans you see without shooting anything else. You'll enter into Kronn Hunter mode. *Note: You won't be hurt if you shoot nothing but humans.

Contributed by: KasketDarkfyre 

Endings

Contributed by: Mike Truitt 

Codes

Contributed by: maximus86, Mike Truitt 

Play as a Kron Hunter

Right when you start the game, shoot the first three humans you see and absolutely NOTHING else. The human should be the same person all three times. In the process, you will lose all of your lives except for one, but don't worry, you will NOT get hit by aliens when you are on your last health. If you do this correctly, the game will stop for a moment and then tell you that you are a Kron Hunter, an alien who searches and destroys the aliens that are invading Area 51. The screen will be drastically different (the colors will change, almost as if they were infra red and night vision combined) and your bullets will look different. The game will be more difficult, but you will gain points MUCH more quickly. Enjoy.

Contributed by: Da Ass Man