Carnival of Terror:
To get more time type in "custard" during the game.

Whack-A-Staff:
To get a bigger mallet type in "a5paragu5".

Cheese Roller:

CheesePrice 
Spicy juppie cheese150 np 
Smoked snorkle cheese300 np 
Triple mustard cheese450 np 
Honey cheese600 np 
Big beefy cheese750 np 
Purple spotted cheese900 np 
Brain cheese1050 np 
Alkenore cheese1200 np 
Mutated cheese1350 np 
Bubbling blueberry cheese1500 np 
Tyrannian dung cheese1650 np 
Quadruple fudge cheese1800 np 
Brick cheese1950 np 
Gooey snot cheese2100 np 
Peppermint cheese2250 np 
Overgrown cheese2400 np 
Heavy Bark Cheese2550 np 
Warty Blue Cheese2700 np 
Fragrant Ummagcheese Cheese2850 np 
Furry Chocomint Cheese3000 np

Haunted House:

Continue down the road 
Stay in the car 
Run from the car in terror 
Continue along the path, avoiding the old house 
Keep asking questions 
Head up to the house to look for the woman's baby 
Investigate the noise in the bushes 
Descend the steps into the dank cellar 
Try to break down the boards 
Read the book on history 
Run back up the stairs 
Continue along the corridor 
Continue 
Shine your torch in his face 
Run down the right corridor 
The end-would you like to try another route?

Codes:

Diseases - Cures 

Achy head - Magic Goop 
Bloaty Belly - Flat-u-less Tabs 
Blurred vision - Wear extra thick goggles 
Crick neck - Wear neck brace 
Hoochie coochies - Vitamin pills 
Itchy Scratchies - Itchy scratchy Cream 
Grumbles - Grumble-gone tabs 
Lumps - Mud bath 
Neogitus - Medicinal tooth brush 
Sneezles - A magic cookie 
Shaky Flakys - Shaky Flaky cream 

Neggs 

Brown - 1 Negg Tokens 
Purple - 2 Negg Tokens 
Green - 3 Negg Tokens 
Orange - 4 Negg Tokens 
Ice - 4 Negg Tokens 
Pink - 5 Negg Tokens 
Blue - 5 Negg Tokens 
Rainbow - 6 Negg Tokens 
Yellow - 6 Negg Tokens 
Rainbow Vanilla - 9 Negg Tokens 
Punegg - 9 Negg Tokens 
Tokens Fish - 20 Negg Tokens 
Fish - 50 Negg Tokens 

BattleDome 

Esophagor - To win, finish any of the quests. 
Fire Faerie - Just win Gornbal 
Edna - To win, finish any of her quests. 
Jelly Chia - Head for the Gallery of Evil and search there. 
Pants Devil - Wait for him to steal something. 
Spider Grundo - Head for the Gallery of Evil and search there.