well, the game is great but i have a problem. i am looking for antimatter cub and i know where it is. but in the right map of the desert hell, i have to jump really a big leap. i tried it several times and i think i am missing some kind of double-jump upgrade? does anyone know how to jump to the land where first zombie walks.
and well, i hope somebody writes some kind of strategy guide and walkthrough. i always have a feeling like i am missing some kind of secret places.

to get the double jump upgrade go into desert hell and enter the door to your left, go all the way through the place and you should see a guy trapped in a cage, shoot the cage and talk to the guy, then go back to the venture guys and talk to the one on the far right. theres your double jump upgrade