There's a glitch on the level The Tomb, only seen it on that level where 2 militia entered and walked all the way through every room, grabbed 2 chests and walked out, not once did they get attack, nor hurt by my fire spell
I'd filled every room with max strength no poison spiders and used all the animal upgrades except for the level upgrade one... says master of tombs for me
Put tanks on a hill, have gunships near them and use artillery at the enemy start point, firing 1 second before the next stage starts and then when the artillery stops fire another one and u can play forever, u lose 8 tanks per stage but those are so EASY to replace... This is one the EXTREME map... Extremely easy more like... and once u got the fuel air bomb NOTHING gets to ur base...
 "Haven: Prelude"){kind=icon}
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 "Shadez: The Black Operations"){kind=icon}