-During level 1, while in the large room with the spaceship there will be a small door. Go inside. When you enter the room , there will be a Flemoid guarding a blue key. Kill it and get the key, then go to the back of the small room and press SPACE. You will get a Tri-Barreled Zorcher.
-During level 2, there are two refrigerated storage rooms. In the second one of those rooms is a secret vent with hidden items. Get on the turbo lift in the back, then stand in front of the big set of crates toward the left. You must stand precisely on the edge of the power lift. When it goes up, run forward to get on top of one of the crates. Notice that one of the panels on your right is different than the others. Open it, then follow the vent. At the end you will find a small blue room with a very big gun.
-During level 5, walk up the stairs (before going down again). At the top, there will be a light to the right. Open it and there will be a Flemoid and a yellow key. Kill the Flemoid and get the key, then turn around and go to the northwest corner from where the key was found. There is a door here. Inside will be a stream. Go to the right and at the end is a waterfall. Go down it. There will be another Flemoid in the room you are in. After you go out of the room, you will be in the Boss' room.
-In the room where you finish the game, go down the hallway and to the right toward a painting. When you are up in front of it,SPACE. There will be a Flemoid and a +100 armor bonus.
-Enable the scottholman code in level 2 to get all the keys. Enter a doorway that has a staircase leading down, then go through the door and transport to the refrigerated storage area. Enter the storage. Go into the elevator and place yourself in front of the highest crate. When you go up, quickly jump off onto the crate. Try opening sections of the wall and when one opens, follow the passage way. You will enter an art room with pictures of the programmers and the Digital Cafe logo.
Activate the andrewbenson code and go to level 2. Go out just a bitand wait for a Flemoid to appear, then run back to the room and go in a corner. The room will soon be filled with Flemoids. Two should be attacking you. Break free from the corner and watch as two aliens attack each other to the death.
Every level has a number of hidden doors. To find them easily, after you explore a level entirely, press TAB to view the map. There will be short yellow lines on some walls of the map. Usually those short yellow lines show where hidden doors are located. Walk up to the place on a wall where a yellow line was shown on the map, then press SPACE. If you are at the correct location on the wall, a hidden door will open. Usually there will be health and weapon rechargers behind the hidden doors.