Kite Tenjo's laboratory

Kaito Tenjo's Laboratory is a location where Kaito Tenjo and Orbital 7 carry out various experiments to locate the Number series as well as various other interests. It is located near the Heartland pier.

Orbital 7 found out that Yuma Tsukumo's Emperor's Key is related to the Number cards here, thus visited the Heartland Highschool under Kaito's orders to retrieve it, otherwise he would be turned to scrap.

After Kaito defeated Ryoga Kamishiro above the school, he flew away with the claimed key and began to study it here. He used Orbital 7's Barrier Light energy in order to force the key to produce a portal which he could enter. He then entered to duel Astral and claim the Numbers which he holds.

In order to get Astral back, Yuma and his friends ask Mr. Kay to send one of his famous Bugman virus' throughout the city in order to locate the key. When one of the virus particles reports the location, Yuma and co run to it. When they get there, the defences of the facility are too strong but thanks to Mr. Kay's virus, the doors open.

Seeing that there are intruders, Orbital 7 sends his brothers, Orbital 5 and Orbital 6 to dispose of Yuma and his friends. But they manage to distract the machines so that Yuma can find Astral.

When Yuma manages to get to the control room, he is faced with more of the buildings complex defences to which when he presses the buttons on, an image of Kaito and Haruto appears, shocking Yuma. When Orbital 7 sees that Yuma is outside the control room, he tries to attack him but fails as his drills get stuck in the wall. Yuma then runs into the control room and enters the portal that Kaito and Orbital 7 created.

The building later explodes, which Yuma's friends think killed him as they didn't see him exit, but he managed to escape it by hiding in the Emperor's Key until the flames had died down.

During the opening ceremonies of the World Duel Carnival, Mr. Heartland questioned Kaito on the mysterious explosion which occurred here which Kaito replies that there was a malfunction with some of the machinery.