Theme Park

Cheat mode:
Enter ZARKON as a name and 8AAACAA9999 or 8AKLR2EC71L as a password. Start game play with the maximum amount of money and the ability to build all rides, buildings, and attractions.
Information in this section was contributed by Zak Deamis and Brown.

Australia and extra money:
Enter ZARKON as a name and PAN6CAA85T9 as a password.

$33 million:
Enter DST as a name and 5AKCQSEBDS4 as a password.

$900 million:
Enter ZARKON as a name and 7AR9R9968O4 as a password to start the game with over $900 million, and all the sites gold except for South Africa.
Information in this section was contributed by maria xxxx.

Hint: Get more money with another name:
Instead of using ZARKON as the main name to get the rides, shops, etc. go to "Password", enter the name you wish to use, then enter the same code again. You will now have lots of money, but you have to get everything by research.
Information in this section was contributed by Misterbluedude.