for last iron fist:
i tried a few times all lost, then came up with this. make only mage and barracks in sequence. and turn all mages to orange ones i cant remember their names now, the sheep converting one!
leave barracks on level 1 in the start, and dont make a stone elemental in the start, just more towers.. level 1 barracks and level 3 orange mages. you can leave two tower points empty, the right and left entrance points.. and when you start making money make elementals one by one .. if you have more money then level up barracks.. no sheep converting magic, cause sheeps ran too fast to kill.. and thats all..
press (+) if you like!
i think i solve bird algorythm, when one bird goes off your screen the other one comes at the same height at yours. so the moment one bird goes, other one enters the screen exact your height.
hope it helps when collecting materials :)
 "Symbiosis: Greenland"){kind=icon}
 "Evilgeddon Spooky Max"){kind=icon}
 "Kingdom Rush"){kind=icon}
 "Chuck the Sheep"){kind=icon}
 "Dynamic Systems"){kind=icon}