In Yu-Gi-Oh!, Synchro Summoning is a method of Special Summoning a monster from the Extra Deck using a Tuner monster and one or more non-Tuner monsters. The levels of these monsters must match the level of the Synchro Monster you're trying to summon.
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Kanto has acknowledged the issue and is actively working to address the problem. The company has provided support resources, including: In Yu-Gi-Oh