Level 1: Destroy tank at end:

You will face an alien tank at the end
of the first level. The easiest way of
destroying it is to just charge straight
at it. Fire like crazy while targeting 
it. If you run out of ammunition, take
out your blade and kill a nearby Borg. 
Once it explodes, kill the remaining 
Borgs to win. 


Level 1: Collapsed gantry

When The gantry collapses and you turn 
on the power, the electric cable nearby
will electrify the gantry. If you try to
cross, you will get hurt, and it is your
only way back. Instead, face the burning
trucks and press R2 to switch to first 
person view. Scroll left, look at the top
of the building, and shoot out the 
electrical box. This will cut off the 
electricity on the gantry.