Area 51 Cheats

To unlock this weapon, beat the first Main enemy (boss). Look around
once you beat It. The Nitro blaster is on the floor by the wall where
a dead mans body lays. Once you found it you can use it as many times
as you want, however it takes away your health a bit every time you
use it. This weapon can freeze any alien except the big ones. It will
freeze them by shooting out a Nitro gas freezer. Once you freeze an
alien (it's frozen for about 35 seconds) You must shoot it with a
different weapon or else it will dry up and you might be screwed. This
weapon freezes them so fast you can freeze five aliens 5 seconds at
the same time( depending on their size).

In the stage Life or Death, there is a small key on a dead soldier in one of the lifts where Cole starts the stage. Grab it to open the small lockers in the stage. One of the small lockers in the first power conduit pit has a databank item that upgrades the alien grenade (it now homes in on enemies).