i could literally explain the trick for any level or upgrades order to beat the game without farming.
Pro-tip: While fighting The End, spam him with hobbits and send titans and totem/wizard/dryad. also move the arrows upwards instead of down so the elemental arrows slash through him multiple times instead of just once, works like a gem.
Note: The trick to increase total killings high score - Select Level 18, Elves, bring the Lord Of Hell On Field, create dryads, phantom archers, archers enough to heal all the damage forest guardian, angel knights and red dragon cause. This would give infinitely long 18th battle, leave the game on for days if you want, then just start creating forests guardians, red dragons alternately... It's an easy win
if u want to make money when u capture castles let one of each color be left then they attack u in "enemy phase" after u do end phase like that u get money without playing yourself and finishing the game with all upgraded units
even now if someone needs to beat colossus here it is: any one who has the wall spell(I recommend golem) all ranged units(magic based he is very weak against magic) then go on building wall at his legs he can never attack it his attack goes ahead of it then it is very easy as he does not moves from his place
even know if someone needs to beat colossus here it is: any one who has the wall spell(I recommend golem) all ranged units(magic based he is very weak against magic) then go on building wall at his legs he can never attack it his attack goes ahead of it then it is very easy as he does not moves from his place