Dimension Fusion

 D.D. Warrior and D.D. Warrior Lady appear in this card's artwork.

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This card's trap counterpart is Return from the Different Dimension. Both of these cards have been used by Seto Kaiba in the anime.

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Both are also Forbidden in the TCG and OCG.

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Dimension Explosion represents the closest attempt to replicate this card's effect in a balanced manner.

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TCG Rulings

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Summon Reactor・SK: If your “Summon Reactor ・SK” is Summoned at the same time as an opponent’s monster (example: “Dimension Fusion”), then it will not inflict 800 damage to the opponent at that time.

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OCG Rulings

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If "Automatic Laser" is activated when multiple monsters are Special Summoned simultaneously by an effect like "Dimension Fusion", then all Special Summoned monsters with 1000+ ATK are destroyed. Special Summoned monsters with less than 1000 ATK are not destroyed.: When "Automatic Laser" is activated when multiple monsters are Special Summoned simultaneously, are the multiple monsters destroyed?

If "Bottomless Trap Hole" is activated when multiple monsters are Special Summoned simultaneously, then all Summoned monsters with 1500+ ATK are destroyed.: If "Bottomless Trap Hole" is activated when multiple monsters are Special Summoned simultaneously, then are all monsters destroyed and removed from play?
Example: Two copies of "Blue-Eyes White Dragon" are Special Summoned by "Dimension Fusion". If "Bottomless Trap Hole" is activated, then both copies of "Blue-Eyes White Dragon

Previously Official Rulings

"Dimension Fusion" cannot Special Summon a "Special Summon-only" monster, like a Ritual Monster or "Chaos Emperor Dragon - Envoy of the End", unless it was properly summoned first.

You cannot activate "Dimension Fusion" when neither player has a monster removed from play; at least 1 player must have at least 1 monster removed from play for you to activate it.

"Dimension Fusion" does not target.

You can use "Dimension Fusion" to Special Summon a monster removed from play with "Different Dimension Gate".

You cannot use "Dimension Fusion" to Special Summon a monster that was removed from play and kept face-down (ex. "Lightforce Sword" or "Different Dimension Capsule").

If you take control of your opponent's monster, and it is removed from play while on your side of the field with "Dimensionhole", when "Dimension Fusion" resolves the monster is Special Summoned to the player's side of the field who controlled the monster when it was removed.

"Dimension Fusion" can Special Summon "Dark Ruler Ha Des" or "Helpoemer".

You can activate "Bottomless Trap Hole" after monsters are Summoned with "Dimension Fusion"; "Bottomless Trap Hole" destroys the Summoned monsters on your opponent's side of the field, and your Summoned monsters are not destroyed.

Felgrand Dragon: If "Felgrand Dragon" is sent from the field to the Graveyard and afterwards it is removed from play (with "D.D. Crow", etc.), "Felgrand Dragon" cannot be Special Summoned with "Dimension Fusion" because "Felgrand Dragon" cannot be Special Summoned from the Removed Zone. If the “Felgrand Dragon” is returned to the Graveyard from the Removed Zone (with “Miracle Dig”, etc.), the “Felgrand Dragon” cannot be Special Summoned from the Graveyard because it was not sent from the field to the Graveyard.

Dark Ruler Ha Des:" "Dark Ruler Ha Des" may be Special Summoned by "Dimension Fusion"if it was removed from play.