Hidden Wepons
If you look carfully you can find hidden rocket luanchers and other wepons. So far i've found 3, and they're normally hidden in places that you don't normally go. Here's two that I found.
On the level before metropolis, before you enter the tunnels you should see a little white stone shack thing that you would normally drive past, well if you go to the top there's a rocket luancher!
On Delta Halo (i think) on the part where the jackels are coming up in the elevator, you can see small stone bridges heading towards the ceiling, well if you follow them all the way to the top there's the alien version of the rocket luancher (forgot what it was called).
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