?

? is a value used for a monster's original ATK and/or DEF to indicate that the value is undefined while not on the field. Less frequently, a value of ? can be used in some video games for other stats with an unknown value, such as a Token Monster's Type.

While on the field, an original ATK or DEF value of ? is always treated as 0. Almost all monsters that use such a value will have an effect that increases the relevant stat or sets it equal to some value, with three exceptions: "Holactie the Creator of Light", "The Winged Dragon of Ra - Sphere Mode", and "Number C1000: Numerounius" (whose stats are intended to be set by "Numeron Chaos Ritual").

While in the hand, Deck, or Graveyard, a monster with an ATK or DEF of ? is treated as having no value for that stat(s) and cannot be searched or otherwise used by card effects that require a defined ATK or DEF (such as "Sangan", "Magician's Circle", "Limit Reverse", and "Skull Conductor") or equal ATK and DEF (such as "Gizmek" cards and "Despian Luluwalilith").

???? and X000 are equivalents used uniquely for the illegal versions of "The Winged Dragon of Ra" and "Slifer the Sky Dragon". In the TCG, the illegal version of "The Winged Dragon of Ra" in Yugi's Legendary Decks uses ? instead.

v t e Monsters and Monster Cards
Level	?^† ???^† -8^† -7^† -6^† -5^† -4^† 0 1 2 3 4 5 6 7 8 9 10 11 12
Rank	???^† 0 1 2 3 4 5 6 7 8 9 10 11 12 13
Monster type	Normal Effect Pendulum Token Maximum^RD
Monster card type	Fusion Ritual Synchro Xyz Link Dark Synchro^† Accel Synchro^† Delta Accel Synchro^† Limit Over Accel Synchro^†
Monster subtype	Tuner Special Summon Dark Tuner^† Armor^† Plus^† Minus^† Plus Minus^†
Ability	Toon Union Spirit Gemini Flip
Alignment^†	Dark Divine Dreams Earth Fiend Fire Forest Light Thunder Water Wind
Attribute	?^† ???^† DARK EARTH FIRE LIGHT WATER WIND DIVINE
Type	Aqua Beast Beast-Warrior Creator God Cyberse Dinosaur Divine-Beast Dragon Fairy Fiend Fish Illusion Insect Machine Plant Psychic Pyro Reptile Rock Sea Serpent Spellcaster Thunder Warrior Winged Beast Wyrm Zombie Celestial Warrior^RD Cyborg^RD Galaxy^RD High Dragon^RD Magical Knight^RD Omega Psychic^RD Black Magic^† Dark Knight^† Dragon Magic^† Electroid^† Gadget^† Immortal^† Immortal (manga)^† Magic^† Plantfolk^† Sea Beast^† White Magic^† Wild Beast^† Yokai^† ?^† ???^†
ATK	? ??? ???? X000 ∞ 0 1 50 100 150 200 250 300 350 400 450 500 550 600 650 666 700 750 800 850 900 920 950 1000 1050 1100 1150 1200 1250 1300 1350 1380 1400 1450 1500 1550 1600 1610 1650 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 2250 2300 2350 2400 2450 2500 2501 2510 2550 2600 2650 2700 2750 2800 2850 2900 2950 3000 3100 3200 3300 3400 3450 3500 3600 3700 3750 3800 4000 4200 4300 4400 4500 4600 5000 10000 100000
DEF	? ??? ???? X000 ∞ 0 1 50 100 150 200 250 300 350 400 450 500 550 600 650 666 700 750 800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450 1460 1500 1530 1550 1600 1650 1700 1750 1800 1850 1900 1930 1950 2000 2030 2050 2100 2150 2200 2250 2300 2350 2400 2450 2500 2550 2600 2700 2750 2800 2900 2950 3000 3100 3200 3300 3400 3500 3600 3700 3800 3850 3900 4000 4100 4500 4800 5000 100000
Pendulum Scale	0 1 2 3 4 5 6 7 8 9 10 11 12 13
Link Rating	1 2 3 4 5 6
Link Arrow	Top-Left Top Top-Right Left Right Bottom-Left Bottom Bottom-Right
Conventions	Conventions of 3000 ATK and DEF Level 4 ATK and DEF conventions
^† Does not exist in the OCG or TCG (ATK and DEF not marked) ^RD Only exists in Yu-Gi-Oh! Rush Duel See also {{Card types}} and {{Card lists}}

?

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