Steps:
1. Turn on power, Link all the teleporters and build the shield.
2. Shoot the rabbit outside the map where the fly trap is on the original giant map, then shoot all of the hide and seek teddies like you would in the original once again and grab the sword where the annihilator would spawn (in the furnace next to quick revive)
3. melee the webbed body on the right side of PaP and it will reveal a shock panel
4. In beast mode shock the panel you just revealed as well as the one opposite widows, then activate the same panel to start a soulbox (protect the generator).
5. Go into beast mode next to power there will be a grapple to a powerup when there, jump down and melee the box and grab the lever.
6. Place the lever next to double tap which starts another protect task on the generator, when done hold your shield next to the generator and run to PaP whilst still holding the shield. When there melee the panel that says "requires more power".
7. Activate the panel and hold your shield out as the robot head will shoot a beam at you. You will need to kill the robot just by redirecting his beam back at him.
8. After killing the robot go back to the panel and activate it. Doing so will activate a short cut-scene and teleport you to power where a new area had been opened.
9. Go around the map and melee all of the webbed bodies. Kill all of the glowing zombies that will spawn with the sword and this will unlock the spider vehicle.
10. Around the map are the symbols from shadows of evil. They are visible from: The power up you have to grapple to, There is a grapple in the newly unlocked area which is fairly self explanatory when you use it and the final one is visible from the AUG A3 wall buy (its in the window above stamin-up). Go to the new area and input all the symbols in beast mode.
11. Opposite widows there will be an egg that is only accessible whilst using spider transformation. Once you grab the egg you will need to run (while still in spider form) all the way to the new area and it will automatically place the egg. This will then give you the prompt for the boss fight.
12. Kill all bosses then you can either go back into the map and play normally or run into the light to end the game.

Hope this helps