You need to stop YahtzeeBrand from expanding in the future to prevent them from taking over all the other shops.
Playing as Paul:
On the floor on the right is your WALLET. Use the door to leave the house and visit the YahtzeeBrand store. Talk to Phil behind the counter and ask him about HQ and part 1. You’ll get a FOLDER with some strange writing on it. Take a TUNING FORK from the shelf at the front and pay for it.
Talk to Elandra at the magazines and ask her if you can help. She’s searching for a particular one and you can find it on the shelves. Select the wanted magazine and she’ll but it, leaving the free gift, a MAGIC MARKER behind. You’ll keep it until you see her again.
Leave the shop to return home again. The tuning fork is vibrating so take it from your inventory and use it on the marks on the floor. It’s stonger in that location. Take the marker from your inventory and use it on the scratches on the floor to draw the same strange symbols you saw at Davy’s house. Use the symbols again to realize you need to put the tuning fork in the center. Take the tuning fork and hold it on the symbol in the middle.
Playing as David Hasselhoff:
You need to put KITT together again. Take the red resistor on the left and put it on the feet. Use the blue CPU and put it in the head. The green battery should go in the body. Use the head to turn KITT back to life. When asked for a password, answer HOFFS.
Playing as Paul:
At Headquarters talk to the lady behind the desk and ask for Mr. Croshaw. He’s not in so ask for his replacement. He’s not available until next month. You don’t have that long. You can compliment, beg or lie all you want, you won’t get anywhere. Take your wallet and bribe the receptionist and you’re in.
The office is empty so have a look around. Use the door on the left to find ‘the janitor’. Use the drawer in the vanity unit to find a combination lock with three numbers. But you can only guess those. Look at the cistern above the toilet to read some graffiti: yellow, red and purple. Leave the room again and open the filecabinet. There are folders with different numbers in different colors. Too obvious you need the yellow (4), red (2) and purple (3).
Leave the cabinet and return to the toilet on the left. Open the drawer next to the sink and enter the combination 423. You’ll find a LIGHTBULB inside. Leave the toilet and put the lightbulb in the lamp on the desk.
Playing as David Hasselhoff:
Walk to the right until you meet the little devils. Ask about Frustro’s castle and how to get in. You need to release Greyson first and for that you need a key. The give you a KEY but it needs to be charged first. Walk to the left and notice the gate when you walk past it. Take the key from your inventory and hold it against the fence as soon as it sparkles. The key is now charged. Walk to the left and use the key on the chamber that Greyson is in. The slot is at the bottom.
Playing as Paul:
When Frustro is arranging his rebirth, you need to stop him. Search David’s pockets and get the SHARD from it. Use the shard on Frustro to defeat him.
Game source: A copy of the game was found here on the internet.