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).