Searching for a "crack" of a tool that is already often available for free (with premium tiers for "donators") is highly risky. Cybercriminals frequently use these keywords to distribute malicious software. BullyWiiPlaza/JMaster-Duel-Bot - GitHub

Overlays like for Master Duel are generally permitted because they only track information you already see and don’t automate actions. They can help you improve your decision‑making.

Master Duel bots are software programs designed to interact with the Yu-Gi-Oh! Master Duel game, automating certain tasks or providing players with an edge. These bots can range from simple tools that help with deck building to more complex programs that can play on behalf of the user.