DuelOption

Constants representing rules enforced in a Duel. These are usually set automatically depending on the type of Duel being played.

Constant	HEX	DEC	Summary
DUEL_TEST_MODE	0x1	1	The user can control both players.
DUEL_ATTACK_FIRST_TURN	0x2	2	The starting player can attack on their first turn.
DUEL_USE_TRAPS_IN_NEW_CHAIN	0x4	4	Continuous Traps cannot activate effects in the same chain they're activated.
DUEL_PSEUDO_SHUFFLE	0x10	16	The Deck is never shuffled.
DUEL_TRIGGER_WHEN_PRIVATE_KNOWLEDGE	0x20	32	Trigger Effects can activate when sent to a location that is private knowledge.
DUEL_SIMPLE_AI	0x40	64	Includes a simple AI player.
DUEL_RELAY	0x80	128	Players in the same team switch to the next when one loses.
DUEL_OCG_OBSOLETE_IGNITION	0x100	256	The turn player can activate an Ignition Effect after a Chain or Summon.
DUEL_OBSOLETE_IGNITION	0x100	256	The turn player can activate an Ignition Effect after a Chain or Summon.
DUEL_1ST_TURN_DRAW	0x200	512	The starting player draws a card on their first turn.
DUEL_1_FIELD	0x400	1024	Only 1 field can be face-up in the Field Zone at once.
DUEL_PZONE	0x800	2048	Includes Pendulum Zones integrated in the Spell & Trap Zones.
DUEL_SEPARATE_PZONE	0x1000	4096	Includes Pendulum Zones separate from Spell & Trap Zones.
DUEL_EMZONE	0x2000	8192	Includes the Extra Monster Zones.
DUEL_FSX_MMZONE	0x4000	16384	Fusion, Synchro, and Xyz Monsters can be Special Summoned to Main Monster Zones.
DUEL_TRAP_MONSTERS_NOT_USE_ZONE	0x8000	32768	Trap Monsters do not occupy a Spell & Trap Zone.
DUEL_RETURN_TO_DECK_TRIGGERS	0x10000	65536	Trigger Effects can activate when the card is sent to the Deck.
DUEL_TRIGGER_ONLY_IN_LOCATION	0x20000	131072	Trigger Effects cannot activate if the card is moved.
DUEL_MODE_MR5	0x2e800	190464	Master Rule (April 1, 2020 revision)
DUEL_SPSUMMON_ONCE_OLD_NEGATE	0x40000	262144	Negated Special Summons do not count for Special Summon limits.
DUEL_CANNOT_SUMMON_OATH_OLD	0x80000	524288	Negated Summons do not count for restrictions that care about performed Summons.
DUEL_MODE_MR1	0xd0700	853760	Master Rule
DUEL_MODE_MR2	0xd0700	853760	Master Rule 2
DUEL_OBSOLETE_RULING	0xd0700	853760	Master Rule
DUEL_MODE_MR3	0xd1800	858112	Master Rule 3
DUEL_MODE_MR4	0xd2800	862208	New Master Rule
DUEL_NO_STANDBY_PHASE	0x100000	1048576	No Standby Phase.
DUEL_NO_MAIN_PHASE_2	0x200000	2097152	No Main Phase 2.
DUEL_3_COLUMNS_FIELD	0x400000	4194304	There are only 3 Main Monster Zones and 3 Spell & Trap Zones.
DUEL_MODE_SPEED	0x620000	6422528	Speed Duel rules
DUEL_DRAW_UNTIL_5	0x800000	8388608	Players draw cards until they have 5 cards in their hand in the Draw Phase.
DUEL_NO_HAND_LIMIT	0x1000000	16777216	Players have no hand size limit.
DUEL_UNLIMITED_SUMMONS	0x2000000	33554432	Players can perform any number of Normal Summons/Sets.
DUEL_INVERTED_QUICK_PRIORITY	0x4000000	67108864	Traps can't chain to each other or miss timing, but can activate in Damage Step.
DUEL_MODE_RUSH	0x7f20200	133300736	Rush Duel rules
DUEL_EQUIP_NOT_SENT_IF_MISSING_TARGET	0x8000000	134217728	Equip Cards are not sent to the GY if their target leaves the field.
DUEL_0_ATK_DESTROYED	0x10000000	268435456	0-ATK monsters are destroyed when battling each other.
DUEL_STORE_ATTACK_REPLAYS	0x20000000	536870912	Battle replays rewind back to the beginning of the Battle Step.
DUEL_SINGLE_CHAIN_IN_DAMAGE_SUBSTEP	0x40000000	1073741824	Only one Chain can occur during each substep of the Damage Step.
DUEL_CAN_REPOS_IF_NON_SUMPLAYER	0x80000000	2147483648	Players can change the battle position of monsters they did not Summon.
DUEL_TCG_SEGOC_NONPUBLIC	0x100000000	4294967296	Private Trigger Effects have the same timing as other Trigger Effects.
DUEL_TCG_SEGOC_FIRSTTRIGGER	0x200000000	8589934592	Simultaneous trigger effects on a chain follow TCG ordering.
DUEL_TCG_FAST_EFFECT_IGNITION	0x400000000	17179869184	Ignition Effects in Chain Link 1 are treated as fast effects.
DUEL_MODE_GOAT	0x7f80d072c	34226374444	Goat Format rules.
DUEL_NORMAL_SUMMON_FACEUP_DEF	0x1000000000	68719476736	Monsters can be Normal Summoned in face-up Defense Position.