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@T3Dragoon Ohhh 1 star only for any upgrade in challenge mode? Thats why its named "Challenge", kid! (see the last page of rating)
He says: Some upgrades are not allowed on the challenges. Ruins the game. 1 star.
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@Redmourne what NoKLimit said. What I did was just set up barracks at the entrance with a Big Bertha helping them out (On top of my normal strategy - you will have the funds to do this by the later-phase gargoyles!) and called the Garg wave immediately so the Bertha's splash damage would hit the ones in the air.
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if you have trouble beating a place try using wizards they are powerful i didnt think so the first 3 times i beat the game but after the 4...