Answer:
Now but i can tell you Ive had this game for years.
Beginning When you start the game, you adopt a cat. Just pet it and you will get information about it. After that, you get a tutorial about the basics. Then you just play with your cat... it may seem boring but just wait!
The house Your house is simple. There are 4 major rooms: the living room, the front entrance, the kitchen and the closet. The living room is were you can use toys to play with your cat. The front entrance is the main room. You can have access to the living room, closet, pet room and bathroom. The kitchen is were yo can feed your cat. The closet is were you can dress your cat up.
Taking care of your cats Make sure you always play with your cat with toys. To bathe your cat, go to the bathroom and use the shampoo and shower head. To feed your cat to to the kitchen and tap on the fridge or pantry. There you have basic cat food. Tap the food or drink and shake it over the pet bowl.
Kitty love When you have 2 cats, male and female, they can have a kitten!!! But you have to first get them to grow up first. Once they are fully grown up, put them alone in the same room. Let them play with toys and on the top screen, once their smiley faces between them turn in a open smiley, congratulations!!!! But beware, ANY cat can have kittens, even brothers and sisters, and mothers and sons!!! It wrong.
Colored kittens Some kittens can have exotic colors when the parents are a different breed!
Growing up To make your cat grow up, pet it to make it have the smiley icon. On its page, it has a heart meter that grows on the smiley icon. Once its filled up, your cat will grow up!
Outside To go outside, touch the door in the front entrance. Then tap were you want to go.
Park The park is were you can play with your cats. You can meet cats that can get you new items. And you have an obstacle course that you can play with you cats in.
Adoption center The adoption center is were you can adopt new cats or give some away.
New places You can unlock new places to go when you make friends with park cats.
Unlocking items You can unlock new food and toys the longer you play the game. You can also unlock toys and clothes with different websites. Here is a link:http://www.cheatmasters.com/cheats/28069/Petz_Catz_Clan_cheats.html
For other info Here is a link but i don't know if i missed anything
http://www.google.com/url?sa=t&source=web&cd=10&ved=0CGEQFjAJ&url=http%3A%2F%2Fwww.rarityguide.com%2Fforums%2Fguests%2F5630750-petz-catz-walkthrough.html&rct=j&q=petz%20catz%20walkthrough&ei=FfmhTcarI4OcsQPDpcX5DA&usg=AFQjCNF0j4rI3ijWPuQQDR1rXoAMycFV8w&cad=rja
Also if you want to restart your game, turn it on and when it says "Licensed by Nintendo" press L X and B. It works, trust me i tried it but yo have to unlock the Adoption Center, but just go to the park to unlock it.
There is all the information i could think of. This took me 20 min. to do so thank you for your time. =) =/ XD 8) smileys