Bio Menace Episode One Secrets

The Bio Menace Series runs on a modified "Good-Bye Galaxy" engine. There are no glitches. It's modified!

If you hold down the keys C, A, and T, then you will get the machine gun with 90 shots, and 99 grenades.
In City Park there is secret level bonus gem at the top of the first tree.
In the caves there is a secret level bonus gem in the roof above the rotating-spike platform.
In No Mans Land ( my favorite level due to a high amount of explosions! ) there is a secret level bonus gem in the ceiling above the hostage.
In Computer Core there is a secret level bonus gem hidden in the second ion cannon from the left.
Hold up until you hear a noise. Press "fire." This is a cheat for a plasma bolt. Nice weapon, but it takes one point of damage from Snake.
Turn left and right six or seven times and press "fire." This shoots out six fireballs, three in each direction. I can rarely get this to work, but maybe you will have better luck.
Turn left and right six or seven times and press "JUMP." This gives you an electron shield. If I remember correctly, this makes Snake look like stone and only lasts a second or two. I can't usually get this code to work either.
Hold up until you hear a noise. Press down. You will be invincible for a few seconds.

That's all I know. If you know of another one, e-mail me.