I don't like Baal(big demon with sword) but he's pretty easy on normal. Get the tower and aim it at him, then come here, read some posts, go back in like 10 minutes, he's dead. His troops and castle are then easy pickings.
to beat stage 13 u the sheild spell or the timestop spell when u get near the black goblin use either 1 of them,then ur uints should attack the black goblin but thay move forwards as they attack, soon ur units will reach ur opponent's base and once ur opponent's base is destroyed u win
The fire titan is useful for dealing with the trojan horse, 1. keep ur main 3 guys at the base 2. send ur smaller troops to stall the enemy's troops 3. once the fire titan is created, he will attack/kill the trojan horse
Endless Migration 
Neon Rider 
Sushi Cat 2 
Elephant Quest 
Droid Assault 
Kingdom Rush 
This is the Only Level 3 
Silverado Apocalypse Blaster 
Truck Attack 
