Ensure the cursor is above the warehouse (or ship). Number based cheats: Double click the warehouse (or ship). Shift based cheats: Once in cheat mode, select the warehouse on the island you wish to cheat on (or the ship). Do not bring up the prompt again to input this character. Now press A (alternatively maybe Q, German lowercase sharps (“ß”), or “ss” – your mileage may vary). An underscore (prompt) will appear in the bottom left of the screen. This section is based on various cheat sites and forum posts. You may not be able to get every cheat to work in every version.
There is some confusion surrounding what the cheat codes are, how they function, and which apply to what version.