Yu-Gi-Oh! Legacy of the Duelist: Link Evolution (Switch)
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Quick Farming for Duel Points and Cards
You can select/click your deck during your turn to forfeit. Doing so rewards you with 600 to 900 duel points and a card from the opponent's pool. It's tedious, but 60 or so forfeits would provide every card an NPC has and between 24,000 and 36,000 duel points.