Lego Island

Inside the Info Centre, keep clicking on the arrows until an elevator appears.
Enter the elevator and click on the 3rd floor.
Two arrows will materialize.
If you click on the right one, a desk appears.
Now, click on the middle drawer of the desk and you will be given clues aboutacave code. Now, while playing the game, press [T] and [Z] simultaneously to make the flowers and trees dance.
(Information from Cheat Machine)