If you're having difficulty near the end, retrain and go all melee. Put your points in gladiator tree. I had it maxed out, and sailed through after having struggled with the wizard and ranger trees.
I started out with 4/5, but after some tries at several levels (which I allways pass in the end) I'm down to 1/5. There's simple to many levels that require ridicoulos precission or timing.
The different behaviours:
Fire: Simple: breathe some fire.
Healing: either heal the injured humans, or breathe on the dead bodies.
Growth: either breathe on trees, or on fields.
None: Either kill the humans, or don't.
These will also grant the different titles.
Setup for Epic victory:
Matz: Cpunter, counterx2, Defender. Boost magic defence as much as possible. In the final fight, just defend all the time, and take him oput with counters.
I also had Airstrike and that power that grants a special bomb for airstrike, that helped a lot.
For Natz, make sure you have Bunny and Bunny!!!. Everything else is optinal. And don't waste time reviving her when she dies in the final fight.
For the hard badge, follow this guide (http://www.reachground.se/2008/11/09/remembering-the-alamo-badge-storm-the-house-3/). Don't despair if you can't afford everything it mentions, the basic guidelines are fine as is.
Lvl 63, and only needs to beat the last map. Skill setup:
Maxed focus, mana gain mastery, dual gem mastery, resonance, replenish and turpulence. Lvl 9 in radiance and recharge.
Lvl 8 in forge, and lvl. 2 towerbuilder.
Pretty easy. On lvl. 2, use your man for one floor, the elevator with gun for the other.
Otherwise, buy new elevators whenever you can, and put machine guns in them. When you can afford it, put a lser cannon in them. Sell machine guns to make room for more lasers.
SA4: http://i25.tinypic.com/282pbf7.jpg
This worked for me, once I learned to do the juggle right. It requires some fine timing on the selling/building of the juggle-towers, but it's possible.
For 24: Don't upgrade the snap towers. Snap a couple of towers, preferable near the center (of course take down some creeps with them). Build pellet towers. Upgrade them to snipers.
Continue building pellets and upgrade them to snipers. Snap when it makes sense, and build pellets on the newly cleared ground.
 "Einstein's Riddle"){kind=icon}
 "Shadowreign RPG"){kind=icon}
 "Icebreaker"){kind=icon}
 "Obey the Game"){kind=icon}
 "Level Up!"){kind=icon}
 "Dragon Age: Journeys"){kind=icon}
 "How to Raise a Dragon"){kind=icon}
 "Zening"){kind=icon}
 "Alice is Dead - Ep 1"){kind=icon}
 "Epic Battle Fantasy 2"){kind=icon}
 "Storm the House 3"){kind=icon}
 "Thing-Thing Arena 3"){kind=icon}
 "GemCraft chapter 0"){kind=icon}
 "The Next Floor"){kind=icon}
 "Multitask"){kind=icon}
 "CycloManiacs"){kind=icon}
 "Desktop TD Pro"){kind=icon}