Title: Works well but use responsibly
: Many Island scripts work by directly modifying client-side values. A typical script might scan for all "Tool" objects in the game, clone them, and assign massive stack values: islands dupe script
The developers have, in the past, performed "economy wipes" where they reset the progress of anyone caught using exploits. You could lose months of legitimate hard work just for trying to dupe a few items. Is There a Safe Way to Get Rich? Title: Works well but use responsibly : Many