Hex cheat:

change money
edit S301_???.SAV
go sector 30 offset 271 - 272

Various Codes:
     Enter codes during gameplay:

all buildings                          All Buildings Unlocked
quick quick quick!                     Faster construction
Alt + Shift + 4                        Insant: $5,000
costa del dosh                         Infinite money
Shift+Alt+T                            Topless people
At the map screen press Shift+Alt+U    Unlock all levels

Extra money:
     While playing a game, hold [Shift] + [Alt] and keep pressing $.

Level select:
     Hold [Shift] + [Alt] and type allbuildings at the main menu.

No sharks:
     Hold [Shift] + [Alt] and type goawaysharks at the main menu.