i helped my friend beat turok a few months ago and i think the final boss was a tyrannosaurus rex and to beat him you have to find a shotgun use flares to distract him and try to kill and when you get the chance you can kill by putting a grenade in his head don't try to throw it though it doesn't work :)
there is no tree house level on turok
you fight it
Beat every stage and boss to reach the final story, and beat it. Devil Doom is the final boss.
You shoot it.
Try to find the boss's weak spot in the final level of the game
Beat the final boss, Yami, in the Ark of Yamato.
Play through it and beat the final boss.
beat bellum, the final boss
Beat the final boss.
By defeating Vaati, the final boss.
you will beat the game after you defeat the final boss in world 8
try the best you can