The game is designed for two or more players. Unlike games like Magic: The Gathering , where players attack each other's life points, INWO focuses on .
Because the game had a complex release history involving starter decks, booster packs, and limited-edition promos, a complete collection is difficult to compile. Furthermore, the rise of digital manipulation means many fake cards circulate online.
: A factory-sealed display case containing 36 booster packs.
The original release, often sought in PDF form, consists of a specific card count and structure: