V Jump Confirms how many Monster Zones Rush Duels use.
A blurb about the anime confirms the Duel Disks modded by Yuga intentionally reshapes itself into a Seven, and that the Rush Duel format uses 3 Monster Zones.
[Sevens/Rush Duel] Number of Monster Zones
By NeoArkadia
NeoArkadia
NeoArkadia is the 2nd Number of "The Organization" and a primary article writer. They are also an administrator for the forum Neo Ark Cradle.