Diabolik: The Original Sin is an adventure game based on the character Diabolik; an Italian comic book character known as the "king of terror" and "the perfect thief". The player controls the "Robin Hood"-character Diabolik, as well as his girlfriend "Eva Kant", and briefly some other characters in a few chapters. The Original Sin refers to a valuable painting which Diabolik is forced to steal as his girlfriend is held captive as a hostage.
In additional to a standard point and click interface, Diabolik: The Original Sin features a stealth system, and some action elements which require the player to act quickly in order to succeed. The game uses 3d characters on animated backgrounds, and has comic book-like animations.