Yu-Gi-Oh! Master Duel: What Is Pendulum Summoning?

thegamer.com:

One of Yu-Gi-Oh!'s most famous rules is that you can only usually summon one monster per turn. While there are lots of ways around this, especially in Yu-Gi-Oh! Master Duel, one of the biggest and most flagrant "Screw the rules, I have money" ways to do it is with the Pendulum Summoning mechanic.

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With just two monsters, you can quickly fill the field with many of your best pieces. But knowing how Pendulum Summoning works, and how to build your deck around it, is vital to getting the most out of it. Here is everything you need to know about Yu-Gi-Oh! Master Duel's Pendulum Summon.

Pendulum Summoning is one of the game's six types of Special Summon. Unlike some other types of Special Summons, you can only Pendulum Summon once per turn, but you can summon multiple monsters at once with it. To do this, you'll need special monsters known as Pendulum Monsters.

You can identify a Pendulum monster by it being a Monster card colour the top half, and a Spell card on the bottom. They also have two gems on either side of the card – a blue on the left, and a red on the right. The number underneath this is the monster's Pendulum Scale. For example, D/D Dog has a Pendulum Scale of three, while Archfiend Eccentrick has a Pendulum Scale of seven.

Pendulum Monsters are special because they can either be summoned as monsters, or placed on the field as Spell cards. When used as spells, they're placed into the farthest left and farthest right of your Spell and Trap zones – known as Pendulum Zones when a Pendulum Monster is in them. When a Pendulum Monster is in a Pendulum Zone, it's treated as if it was a Spell card, not a Monster. You couldn't Raigeki a Pendulum Monster