I realized in many duels that the combined levels of the monsters used to Synchro Summon Scrap Dragon can be more than 8, even so using 3 level 4 monsters as the materials (the total levels are 12), as if it was a Ritual Summon. I think this only happens with that monster.

The level 12 case is in this replay. I don't know why my YGO doesn't load it, but I uploaded it anyway.

My YgoPro will not load this replay either.

What server and game version did you record this on? IF you get another replay please post it, or if you can specify how to do this so I can recreate it that would be great.

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YGOPro 1.033.7 V2, I think it was Europe server, because USA was not working. I'll try to upload a new replay then. You can also use a Scrap deck and summon as many Scraps as you can (at least one tuner) whose total levels are 8 or more and try to use them all to the Synchro Summon.