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'''Game mechanics''' refer to any action that automatically happens due to the interior workings of the Yu-Gi-Oh! game. They are not treated as effects and most of the times cannot be avoided.
==Names==
Token Monsters have a few rulings that go with them. First of all, they cannot be face-down on the field, so "[[Book of Moon]]" cannot [[Target]] them. If an effect that would flip multiple monsters on the field to face-down [[Defense Position]] effect them, they are simply switched to face-up Defense Position. Secondly, they cannot exist outside the field. If a card effect would remove them from the field (by sending them to the Hand, [[Deck]], Graveyard, etc.) they simply disappear. If they are [[Destroyed by Battle]] they never hit the Graveyard, so "[[Blackwing - Shura the Blue Flame]]" wouldn't be able to activate its effect. Finally, Token Monsters are always owned by the owner of the card that summoned them. Thus, if "[[Owner's Seal]]" is activated, "[[Ojama Token]]s" move to the side of the field of the player who activated "[[Ojama Trio]]". Additionally, Token Monsters cannot be used for [[Xyz Summon]]s.
As long as the card that summoned them allows it, Token Monsters can be used as [[Tribute]]s Tributes for [[Tribute Summon|Tribute]]s or [[Ritual Summon]]s, or as [[Synchro Material Monster|Synchro]]s or [[Fusion Material Monster]]s. However, if a card requires the Tributed monster to go to a certain zone outside the field, like the Graveyard or [[Banished Zone]], Token Monsters cannot be used.
==Using Cards and the Graveyard==
Only one [[Field Spell Card]] can be on the field at a time. If a player has one on the field and the other player [[Activate]]s a second one, when the second one's Activation resolves, the first one is automatically destroyed. Because this is a Game Mechanic and not a card effect, cards like "[[Magical Citadel of Endymion]]" are not protected from this destruction. However, if the second Field Spell Card is destroyed before its activation resolves such as with "[[Mystical Space Typhoon]]", the original one is not destroyed.
The player who controls the Field Spell Card is also allowed to play a different one. In this situation, however, the first one is destroyed and sent to the [[Graveyard]] before the second one is activated. This creates a minor gap of time in which there is no Field Spell Card on the field, a large enough gap to destroy cards who cannot survive without the presence of one, such as the "[[Earthbound Immortals|Earthbound Immortal]]" and "[[Malefic]]"monsters.
Due to the 2014 rule change, both players are allowed to control one Field Spell Card at the same time.
==Equip Cards==
Equip cards continuously target the equipped monster to make sure it is still there. If that monster is no longer face-up on the field, the Equip card is automatically destroyed. This can be due to either being destroyed or removed from the field by battle of card effect, or simply being flipped face-down with "[[Book of Moon]]".
Additionally, Equip cards also continuously target to make sure the equipped monster fits its requirements, and if it suddenly no longer meets its requirements, the Equip card is destroyed.
*Example: If "[[Machina Peacekeeper]]" is equipped to a "[[Machina Fortress]]" and "[[Zombie World]]" is Activated, "Machina Peacekeeper" is automatically destroyed because "[[Machina Fortress]]" has been changed into a [[Zombie]]-Type and no longer meets the [[Machine]]-Type requirement.
==Fusion Substitutes==
There are multiple cards with the following effect: "''You can substitute this card for any 1 Fusion Material Monster. When you do this, the other Fusion Material Monster(s) must be the correct one(s).''" While these are great cards for [[Fusion Summon]]ing, there are other limits to their effects that aren't listed.
They cannot be used for the [[Special Summon]] of an "[[Elemental HERO Neos]]", "[[Gladiator Beast]]", or "[[VWXYZ]]" [[Fusion Monster]], because the listed monsters are not used as Fusion Material Monsters. They can only be used as substitutes for specifically named Fusion Material Monsters, thus they cannot be used as any "1 [[Ojama]] Monster" for "[[Ojama Knight]]" And while they have effects while in the Hand, they have no effects while in the [[Deck]], so they cannot be used when fusing from the Deck with cards like "[[Future Fusion]]".
== Pendulum monsters ==
