Yuma Turn 1: Yuma Normal Summons Zubaba Knight (1600/900) in Attack mode and sets 2 cards.
Roku Turn 2: Roku activates the Ritual Spell Black Luster Ritual to Tribute the Tri-Horned Dragon in his hand and Ritual Summon Black Luster Soldier (3000/2500) in Attack mode. Black Luster Soldier attacks Zubaba Knight, buy Yuma activates his face downs. 1st is his Quick-Play Spell Ego-Boost which increases the attack of Zubaba Knight by 1000 until the end of the Battle Phase (1600 -> 2600). 2nd is Half Unbreak which targets Zubaba Knight in order to prevent it from being destroyed by battle this turn and halve any Battle Damage from battles involving it (Yuma LP: 4000 -> 3800).
Yuma Turn 3: Yuma Normal Summons Gogogo Giant (2000/0) in Attack mode. He then activates Flip Flap to switch Black Luster Soldier to Defensive mode. Zubaba Knight attacks Black Luster Soldier. Since it's attacking a face up Defensive mode monster, Zubaba Knights effect destroys Black Luster Soldier, without applying damage. Gogogo Giant attacks directly (Roku LP: 4000 -> 2000).
Roku Turn 4: Roku activates Card Destruction forcing both players to discard their entire hand and draw cards equal to the number of cards they just discarded. He then sets a monster and a card.
Yuma Turn 5: Yuma Normal Summons Gagaga Magician (1500/1000) in Attack mode. He then activates Monster Reborn to Special Summon Gogogo Golem (1800/1500) from his GY in Attack mode. Gogogo Giant attacks and destroys Roku's set monster (Gamma the Magnet Warrior) (1500/1800). Gagaga Magician attacks directly (Roku LP: 2000 -> 500). Zubaba Knight attacks directly, but Roku activates his face down Defense Draw to reduce the Battle Damage he would take to 0 and draw a card. Gogogo Golem attacks directly, but Roku discards Kuriboh via its own effect to reduce the Battle Damage to 0.
Roku Turn 6: Roku activates Pot of Greed to draw 2 cards from his Deck. He sets a monster and a card.
Yuma Turn 7: Yuma Normal Summons Gagaga Girl (1000/800) in Attack mode. Gagaga Girl attacks Roku's set monster, but Roku activates his face down Mirror Force to destroy all of Yuma's monsters in Attack mode.
Roku Turn 8: Roku Flip Summons Queen's Knight (1500/1600) and Normal Summons King's Knight (1600/1400) in Attack mode. Since Roku Normal Summoned King's Knight while Queen's Knight was present on his field, he activates the effect of King's Knight to Special Summon Jack's Knight (1900/1000) from his Deck in Attack mode. Roku activates Polymerization to fuse Queen's Knight, King's Knight, and Jack's Knight in order to Fusion Summon Arcana Knight Joker (3800/2500) in Attack mode. Arcana Knight Joker attacks directly (Yuma LP: 3800 -> 0). Roku wins.
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Yugioh Off-Screen Duels
RandomThese are my ideas about what happened in the Duels in any of the Yugioh Series that we didn't get to see. For example, Aster(Edo) v.s. Yusho in Arc V. Or Yuma's friends Dueling the 7 Barian Emperors in episode 124 to 125 of Zexal. This is just for...