For the later levels, you can pretty much get away with spamming wizard towers (esp. on easy), so just put all your upgrade stars into wizard towers, reinforcements, and meteor. Don't forget to make a the few of the wizard towers spawn elementals to block to the path.

I even completed quite a few of the challenges on easy this way ;)

I've just got a couple more challenges left to do and then I've done everything, all I can say is try, try and try again, memorise the waves so you know what's coming, it really helps if you place the right towers in the right places and use your meteor at the right time. For example, one of the later levels you should have a couple of mage towers for the right path then spam arrow towers for the left.

Basically, if your stuck, just learn the level and don't be afraid to completely switch your tactics up. I really struggled with this game at first but I'm confident I've got it sussed out now.

Fantastic game Ironhide, I really hope to see more!

omg my data was erased omg, i h8 it when this happens i am done with this game

Yes, while the campaign can be quite easily finished, the challenges are very tough. Stuck around lvl3-4 for iron, can't find the right combination...

@iliachulsky I can't believe you beat the Twin Rivers map on Normal difficult and Iron Mode... maby you mean another map???

I'm afraid the Twin Rivers Map (Iron Mode, Normal)  is impossible to beat!

Iron mode on Twin Rivers is just about building towers everywhere. Slowly upgrade the towers in the front of the spawning point. While reinforcing when necessary. I find the difficult of this game annoying and fun.

well i did twin river - iron mode - on easy without trouble, but are you sure you beat Twin Rivers - Iron mode- on NORMAL ???

[URL=http://imageshack.us/photo/my-images/17/krcomplete.png/][IMG]http://img17.imageshack.us/img17/1586/krcomplete.png[/IMG][/URL]

Wooo! Finally.

[IMG]http://i55.tinypic.com/166fadx.png[/IMG]

Sorry for double post, fail upload.

You know what... forget it. Apparently image codes don't work. Point is, I just completed all challenges. Sorry for TRIPLE post. ):

Curse you AG forum.