The MOD changes the starter decks. You start with a 2005-era "Starter Deck: Yugi," which is trash. To unlock cards, you have to duel the roaming Legendary Duelists.
However, if Konami ever re-releases Power of Chaos on GOG or Steam, . Support the official release. Yu-Gi-Oh- Power of Chaos - Joey-s World -MOD- -PC- RePack
Yu-Gi-Oh! Power of Chaos: Joey's World is a popular fan-made modification for the classic PC game, . These mods are often distributed as "RePacks" to simplify installation, including pre-unlocked cards and updated visuals. Key Features of the MOD The MOD changes the starter decks