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Successfully complete story mode to unlock the bonus "Infinity" level, with randomly generated floors.
Defeat the Infinity level 50 Boss.
Defeat Colossus (Sector 2 Base Boss).
Defeat Enforcer (Sector 2 City Boss).
Defeat the Infinity level 30 Boss.
Defeat the Infinity level 10 Boss.
Defeat the Infinity level 40 Boss.
Defeat the Infinity level 60 Boss.
Defeat the Infinity level 20 Boss.
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Start to reload then switch to a different weapon.
Switch back and your weapon will be reloaded about three times
When Enforcer puts up his big shield and starts advancing
down the field, go through it. Get behind and follow him. Take
out your Judgment or Trident (make sure it is upgraded to at least
level 3) and shoot the yellow circle on his back. Use the quick
reload tactic and he should go down very easily.
Upgrade your Vulcan to its highest level and stock
up on ammunition. Throw a few honeypots to lure Mantis into one
spot so that he will not attack then unload on him. This brings
his health down drastically.
For the three Bosses in Sector 2, their weak spots
are as follows.
- Enforcer (City Boss): On the machine's back near the bottom, is a circular lighted area. Your crosshairs will lock on to that area. Shoot it with a shotgun or rocket launcher for best results.
- Colossus (Base Boss): Climb the stairs until at the very top and look down at Colossus's head. When the head opens, shoot it with a shotgun for best results (1/5 to 1/4 damage).
- Mantis (Ruins Boss): Get close to the bug and shoot the underside. Shooting its shell will not do anything, as it deflects most of the shots. The best weapon is the Photon MG because it stops Mantis in its tracks.
Strategy guides from GameFAQs