A1: Just simply sleep, and burn your ps2.. that will defeat the fallen..

A2: I might be able to help if its the ps2 version, what you do is that you will have to shoot him and then quickly hide behind one of the portals so that he will shoot them, after 3/4 are destroyed he will go through the last one and you will fly up higher to fight him for the last time, what you do is, after he sends a shockwave of fire out you jump in the air towards him and press either triangle or square, and then you hit him to more times after that and then you will go into a reaction command video repeat this until he is defeated!

A3: On first part you go in front of portal things then shoot him when he shoots back dodge away

A4: Go to the portal things and wait there till he shoots a yellow sphere at you. then move out of the way. do this 3 times.

A5: The Fallen is very easy to defeat.First of all use evade and hide at big objects to avoid being hit by the bricks.After you get at the portal you need to fight the fallen hand to hand.Shoot the fallen to make him charge his weapons then quickly hide in the back of the portals and he will shoot the portals and it will make him vulerablethen attack him or if you want to avoid being hurt shoot him.Then hide in the back of another portal but make him charge again his weapons hide in the back of another portal then he will be vulnerable again shoot him and then continue like this until 3/4 of the portals are destroyed.Then he will get more higher on the pyramid then this time you need to jump over the flames that the fallen creates when he stomps his feet or punches the ground.When you jump over the flames quickly attack the fallen and then you need to press some buttons and continue like this until the fallen is dead.Is very easy compared with megatron.