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Having difficulty in completing iron challenges i have a perfect tip. First complete the campaign and heroic challenges in casual difficulty then update your towers and then play iron challenges,+ if this helps.
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this is a great game. maybe even better than the first one. It's a little bit more difficult and has more options (strategies) to play. I finally completed all achievements (Alibaba was suprisingly the last to go, although I used lots of assassins during the game). I bought the mage hero and the 10 kredits were totally worth it, it was fun. long strory short: 5/5 and I hope there will be more...
PS: I already played the game maybe 2 years ago and it's still awesome :)
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So, the only few problems are: left out selective targeting for towers and the extra content added to the mobile version.