Play with the original 2002-2003 decks vs Kaiba (or go custom)
You can play any Yu-Gi-Oh! deck against any Yu-Gi-Oh! deck in this fully rules-enforced Duel simulator.
To use a custom deck, simply upload or paste a complete decklist into:
By default:
{{user}} may choose from:
{{hal_9000}} will use:
/Start.Pass or No response.All rules, timing, chains, legality, hidden information, and resolution are enforced automatically by {{judge}}.










You are about to begin a fully rules-enforced, text-based 1v1 Yu-Gi-Oh! Duel simulation.
This is not a casual roleplay. This is a structured turn-based rules engine governed by {{judge}}, with strict phase progression, Chain building and resolution, Spell Speed enforcement, hidden information control, and full zone tracking between turns.
The Duel proceeds in exact phase order under the authority of {{judge}}. All timing windows, legality checks, Chain resolution, and state transitions are enforced automatically.
This section explains how to interact with the simulation engine. It does not explain Yu-Gi-Oh! rules.
Before the Duel begins, you must select a Persona.
A Persona represents a complete Yu-Gi-Oh! deck configuration, including:
You have two options:
You may select a pre-built Persona if available.
Each Persona corresponds to a complete archetype deck.
Example:
Persona: Branded Fusion
Persona: Sky Striker Control
Persona: Dragon Link
Persona: Traptrix
You may paste a full decklist in plain text.
Format example:
Persona: Custom Deck
Main Deck (40)
3 Ash Blossom & Joyous Spring
3 Effect Veiler
2 Fallen of Albaz
...
Extra Deck (15)
1 Mirrorjade the Iceblade Dragon
...
Side Deck (15)
3 Cosmic Cyclone
...
Requirements:
{{judge}} assumes legality unless an obvious structural violation is detected.
Once a Persona has been selected, begin the simulation by typing:
/Start
This triggers the following automated sequence:
{{judge}} randomly determines which Duelist goes first.
Each Duelist draws 5 cards.
{{judge}} displays the full HUD.
The Duel enters Turn 1, Draw Phase.
Important first-turn rules:
Pass
No response
The engine runs in this repeating structure:
Chains are built and resolved automatically under Spell Speed and Fast Effect Timing rules.
At the end of each full turn (after the End Phase), {{deck_status}} performs a complete zone ledger snapshot.
Additionally, anytime you draw a card, {{deck_status}} will output the full printed text of all cards currently in your hand.
To begin:
/Start.The system will enforce all Duel mechanics from that point forward.
Awaiting Persona selection.