Makeshift Survival Mode (And Easy Drebin Points!)
In Outer Haven, the first area will be inhabited by numerous frog soldiers, all with P90s.
Kill one, and she will be replaced, they will never stop coming.
P90s are worth 1,500DP apiece. It's a pretty good way to get that one item you've had your eye on.
With enough patience, you can have as many Drebin Points as you desire.
It's recommended that you kill them with a P90 (Since they're dropping them anyway, you'd never run out of ammo).
Good luck!
More tricks, tips and cheats for this game are right here - Metal Gear Solid 4: Guns of the Patriots cheats
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