While playing a game, press: [Shift] 4 to get more money.
To Unlock Deinosuchus name a ready made exhibit 'Super Croc'.
To Unlock the Unicorn, Name a Ready-made Exhibit 'Xanadu'.
Unlock Triceratops by naming a ready-made exhibit 'Cretaceous Corral'.
Note: If you don't have a Ready-made Exhibit, then build a few exhibits, and then name the first one 'Super Croc' ect.
Unlock All Dinos
Name a guest DINOMAN. The cheat turns off when you restart the game.
To unlock the Deinosuchus, complete all scenarios. Select "No" when the final scenario concludes and you will be told that the Deinosuchus has been unlocked.
To get a mermaid in "Marine Mania" create a new tank, then if you have the mermaid statue you can put it in the tank, it will break open and become a mermaid.