"I can't see anything around us. This is insane" David said "I guess we should try to figure out where the hell we are and how we're gonna get back home. Someone pick a direction"

Silence.

"Yeah... me too guys" David fell back to the floor, defeated. After a few more minutes of relative silence and hopeless staring out into the abyss, David's head perked up, thinking he had just seen something sparkle in the distance.
"Anyone else see that?" he said as he jumped to his feet. He waved his arms frantically and began to shout "HEY! OVER HERE! HELP US!"

It sparkled again, slightly brighter than before, more noticeable. David kept waving his arms and crying for help. Some of the others joined in as well, until finally, their savior came into view. It appeared to be simply a bundle of pixellated light, floating in the darkness. It silently floated into their midst and rotated around, seemingly scanning the lifeforms around it. The light around began flashing as it began to speak, sounding remarkably like a calm C-3PO
"Hello there. I see you all arrived safely. I can sense your confusion, so please allow me a moment to explain. I am Program Directory 348009- Navigation and Caretaking. For simplicity, you can call me Navi, if you wish. Apologies for this whole event, but once I explain, I hope you all understand that I had no choice. This is The Mainframe, or at least, an unused section of it. The Mainframe. Allow me a moment to convert what I have to say into terms you will all understand." 

Navi let out some robotic beeps as it processed. then it continued "While we have no remaining records on the full history of it, we know that The Mainframe has existed at least since the zenith of your world's technological boom. Think of it as a nexus point, upon which your internet was based, and it is under a grave threat, that I believe only you can stop. It began with a corrupted data file, infecting Default State Programs, which acted as the 'worker bees' of the proverbial colony here. They morphed into something akin to a virus, and began to attack the various systems of The Mainframe. The only area they were unable to conquer is the Datacore, The central processing unit of the entire system. If they were to reach that, they would have access to everything networked to The Mainframe. I fear they would able to use that access to destroy both our worlds. So I locked myself out and enacted a security measure. Using data from these 'video games' that your people adore, I have constructed a gauntlet of challenges to slow the Default's progress. They cannot adapt as quickly as organic beings. Even through their preferred method of hacking and infecting other AI constructs throughout the game worlds, they are limited by their programming. That is where you come in. If you were to enter these worlds and complete the challenges within before the Default, you would gain the key constructs necessary to access the Datacore, you could then use its power to delete the virus and return home"

"This is crazy" David said "I don't know why we were chosen, I don't know if we can do this, hell, I don't even know if this is real, but if this is the only way for to get home, I think we should do it"

He turned to his friends to see their response "What do you say guys? I did promise you all an epic week of gaming.... I mean yeah, this is not exactly the fun-filled relaxing time I imagined, but pretty close second right?"

"Excellent" Navi exclaimed "Please allow me to properly arm you for the challenges ahead"
At those words a band of light appeared around each of them. When it faded, they saw that a device had appeared on one of their arms, it resembled an old NES Power Glove, with way less buttons. Before any of them could comment a door began rising from the abyss in front of them, a wall constructing itself around it as it went. Above the massive door, in big block lettering, the words [b]PRESS START[/b]

"The device you have will prove to be an invaluable tool. It will allow you to properly equip yourselves for the challenges ahead. A quick analysis of your online records show that each of you have a particular video game you have shown mastery in. By pressing the large red button in the center of the control board, you will be equipped with armor and abilities from those games. The buttons surrounding it will allow you all to access those abilities, and the blue button will bring up a holographic readout of the games you will face as well as any other information I can offer"

David took the lead, tapping the indicated button on his power glove. A brilliant flash of white light surrounded him, and when it cleared he was outfitted in the armor of a COG Gear.
"Ok Navi, this is pretty cool. As long as you don't start screaming HEY LISTEN, we're all good" David joked.

"Scanning. I have located the source and appreciate the humor. Please proceed to the door ahead"