The Barian race is able to use the Overlay Network to instantly teleport themselves to another place. The crests utilized by the Vetrix Family are able to do the same. Later in the series, the Different Dimension Airship uses the Overlay Network to travel as well.
The Overlay Network can be used for communication, as sound can travel through them. When used this way, the portal stays open until the message or conversation is finished transmitting.
According to Konami, Xyz Monsters have traveled to Yuma's dimension from the other side of a black hole. When a Duelist performs an Xyz Summon, the Xyz Material monsters transform into streaks of energy, and the Overlay Network appears in the form of a portal that the energy streaks enter. The portal then explodes, and the newly Summoned Xyz Monster unveils itself. In Yu-Gi-Oh! ARC-V, instead of exploding, a column of blue lightning emerges from the center of the portal. Most Xyz Monsters are Xyz Summoned through a red, spiral-shaped portal, though "Neo Galaxy-Eyes Photon Dragon" utilizes a pink one and "Shark Fortress" a blue; a similar Network is used in Yu-Gi-Oh! VRAINS. After being Summoned, the Xyz Materials then become Overlay Units that orbit the Xyz Monster as orbs of light.
The "Number" monsters all use a yellow, galaxy-like portal. In addition, the sealed form of the Summoned "Number" appears out of the portal first, before transforming itself into its true form (some "Number" monsters such as "Number 88: Gimmick Puppet of Leo" and "Number 33: Chronomaly Machu Mech" do not have sealed forms and simply emerge complete from the Overlay Network; others such as "Number 9: Dyson Sphere" are too large to ever fit in the Overlay Network and instead materialize in space).
When a Duelist performs an Xyz Evolution (whether through a "Rank-Up-Magic" card or otherwise), the Xyz Monster re-enters the Overlay Network before emerging from it in its upgraded form (usually but not always a "Chaos Xyz" or "Chaos Number" monster). Once the monster re-enters the Network, the Network explodes, often taking the form of a large green orb before the monster reforms.
"Galaxy Stealth Dragon" and all Xyz Monsters featured in Yu-Gi-Oh! ARC-V use the "Number" Overlay Network. Xyz Monsters in Yu-Gi-Oh! VRAINS use a blue Overlay Network that is created from an array of energy that the Overlay Units enter.
In Yu-Gi-Oh! 5D's Tag Force 6, all Xyz Monsters are depicted as using the standard red spiral portal. Yu-Gi-Oh! Duel Links and Yu-Gi-Oh! Master Duel, conversely, uses the "Number" Overlay network for all Xyz Monsters, much like ARC-V.
Different Dimension Airship entering the Overlay Network.
A "Number" Overlay Network
A "CXyz" Overlay Network after the monster re-enters
The Overlay Network of "Neo Galaxy-Eyes Photon Dragon"
The Overlay Network of "Shark Fortress"
The Overlay Network in Yu-Gi-Oh! ARC-V
The Overlay Network in Yu-Gi-Oh! VRAINS
- Yu-Gi-Oh! ZEXAL episode 07474: "Attack of the Barians: Part 1"
- Yu-Gi-Oh! ZEXAL episode 04343: "The Dragon Awakens"
- Yu-Gi-Oh! ZEXAL episode 09595: "The Search for Shadows"
- Yu-Gi-Oh! ZEXAL episode 06060: "Doctor Visit"
- "Starter Deck: Dawn of the Xyz". Konami.
- Yu-Gi-Oh! ZEXAL episode 0011: "Go With the Flow, Part 1"
- Yu-Gi-Oh! ZEXAL episode 08484: "Playing Defense"
- Yu-Gi-Oh! VRAINS episode 08282: "Gored"
- Yu-Gi-Oh! ZEXAL episode 0022: "Go With the Flow, Part 2"
- Yu-Gi-Oh! ZEXAL episode 01313: "The Number Hunter, Part 1"
- Yu-Gi-Oh! ZEXAL episode 05858: "Swimming With Sharks"
- Yu-Gi-Oh! ZEXAL episode 04848: "Exit: Astral"
- Yu-Gi-Oh! ZEXAL episode 05555: "Portal of Doom"
- Yu-Gi-Oh! ZEXAL episode 01818: "It's in the Cards, Part 2"
- Yu-Gi-Oh! ZEXAL episode 08383: "Sphere Cube Calamity: Part 2"
- Yu-Gi-Oh! ZEXAL episode 121121: "Mission: Astral World, Part 4"
- Yu-Gi-Oh! ZEXAL episode 138138: "The New World"
- Yu-Gi-Oh! ARC-V episode 0077: "Mr. Mystery"