Klaue, for the final level I suggest using 3 types of troop: Commando, Molotov, and Grenade.
Grenade is only used to take out the enemies around the entrance, so you don't have to worry about being shot immediately, after that it's all Molotov and Commando - Commando for taking out the Heli- enemies from long distance, and Molotov for the rest. No need for the bridges, as the edges of the lava pools don't actually harm you, so you can just land and jump up without worry. You don't even need a Spy with its larger jump for getting stars - they're all in reach. For the last star, Molotov the base of the tower, and once all enemies are dead, give it a couple of seconds before jumping up and grabbing the last star, so you won't take damage from the rubble before the Level Complete screen loads.
You don't need upgrade points nor vehicles - just Commando, Molotov, Grenade, and Tactics. You might even be able to flawless it.
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