Scooby-Doo: Mystery Mayhem Cheats

On episode5 there is a certain part where you have to find a yellow key
card to enter a certain room. To get the key card you go into the room
where there is one bad guy, at the very end of the room there is a
computer if you click on it the computer says you have to have a yellow
key card to activate it. go and climb on some boxes and go to the
dressing box, hurry and get back down and walk up to the bad guy he will
go away and give you the yellow key card.

On the other side of main street from the jail where you have to bust Fred out, there will be a small alleyway. Have Scooby crawl underneath the fence to find the liquid soap, then go back to the side of the jail where the hole is blocked by the cart full of gold. Use the liquid soap, and it will slip right over.

Busting Freddy out of Jail in Weird Wild West:
On the other side of main street from the jail where you have to bust Fred out, there will be a small alleyway. Have Scooby crawl underneath the fence
to find the liquid soap, then go back to the side of the jail where the holeis blocked by the cart full of gold. Use the liquid soap, and it will slip right over.

On level 2, to open the bridge there are four switches. Press switches 1, 2, and 4.