There are two editions of NumZumZero: the regular edition and the Slim Edition.
The Slim Edition box holds less cards, since it does not include Victory Tokens or rules. Instead of using fancy victory tokens, you track your victory points using pen & paper, phone, or match sticks (none of these are included). Rules can be downloaded from the store.
The Slim Edition can also be used to expand your original game to accommodate an additional 4 players.