"The Coming Storm": Dancing sk...
	Bonus options...
	Goo rocket...
	Invisible character can see ec...
	Portal reference...

Slime the gravestones at the start of the level, then pull them down. Each of the skeletons from the graves will do a different dance.

Complete the indicated task to unlock the corresponding entry at the "Options" menu.

Entry	How to unlock
Equipment Strength Upgrade	Collect all art.
Faster Health Recovery	Collect 50% of the art.
Gozerian Rookie Outfit	Complete the game under the Gozerian difficulty. This outfit will allow you to be immune to sliming.
Increased Scanning Speed	Scan 50% of the ghosts and scannable objects.
Invulnerability	Complete the game with all art collected and scan 100% of the ghosts and scannable objects.
No Equipment Overheat	Scan 100% of the ghosts of scannable objects.

Look down with a male avatar, then shoot slime while you jump. It will shoot you up like a rocket.

When you get to the end of a section (for example, going down the stairs to hunt down the Grey Lady ghost, just after they brief you on the P.K.E. goggles), put on your P.K.E goggles and walk through the door or off the staircase. After the other Ghostbusters are finished speaking, you will notice you cannot see your character. You can only see through their eyes, and you can clearly see the trails of ectoplasm (the little colorful clouds of ghost goo) without the goggles on. To exit, return to the firehouse or wait until you get to the next part of the level.

When you get the scan for the Chef's cake it will say "Many researchers believe the cake is a hoax", which is a referrence to the "The Cake is a Lie" message found on walls in Portal.