"How long till we get there Jake?" Finn asked with a heavy sigh and a bored expression.
"A few more minutes, the legs don't get out as often as they used to." Jake replied.
Princess Bubblegum had given them the job of going to an excavation site where a pre-Mushroom War building had been discovered, contacting her with a report on how the dig was going, and to assist in the dig if they wanted to.
A full side of the building had been uncovered by the time they arrived at the site. After relaying the report of how the dig was going to PB over the crystal communication necklace Finn and Jake set to work helping with the dig. Finn did so wondering if it would look the same as the buildings on the island. Gradually, over the course of many days, they excavated the area surrounding the building out.
On the last day of excavation Princess Bubblegum arrived to study the building from close up.
A giant neon sign saying "Flynn's" hung from the front of the building. The trio (Finn, Jake and PB) entered the building and prepared each other for anything. PB looked around with a scientist's eye of curiosity as she examined everything about the building's interior.
She noted the plastic covering every object in the room, the power boxes attached to the wall next to the door and the floor mat with the word "Flynn's" written on it.
"The man certainly liked to show the world what was his." she said out loud to herself. She proceeded to open the larger of the two boxes on the wall to find a series of switches with illegible words written next to each of them.
"Bring in the generator!" Princess Bubblegum shouted out the door.
Moments later, two banana guards ran in with a large tesla-like device carried between them.
"What kind of generator is that Peebes?" Finn asked curiously.
"A wireless one."
Bubblegum flipped a switch on the generator and the building came alive. Many noises started up from underneath the plastic sheets and music blared out of the PA system for the first time in millennia. PB was quick to find the volume controls and take the noise level down to bearable levels.
While PB had been examining the general structure and layout of the building and taking a few notes on various things, Finn and Jake had pulled all the plastic sheets off of the machines.
Finn and Jake stared wide-eyed at all of the now active gaming machines. After a minute or so they began trying to figure out how to play the games. Finn began to think that the 25cent sign on the games matched a large round metal object they had found a bunch of a few months prior. It even looked like it would fit in the slot on the machine. Running on this guess, Finn pulled a fist-full of quarters out of Jake's fat and put one in the machine.
The game (a.k.a Pac Man) immediately responded with a series of sounds, a flash on the screen and the game started. After a few minutes of playing Finn was defeated by Pinky. Jake then took a turn and after immediately loosing, gave up and went with Finn to test out all the other games.
PB, eventually, noticed this and asked for some quarters to try one of the games. Finn gave her a few quarters which she immediately put to use in decimating a number of the games.
The Banana Guards eventually joined in the fun and played long into the night on the various arcade games. Finn eventually ran out of quarters and just started using some old gold coins they hadn't dropped off at home yet.
By the time Finn, Jake, and PB had all made it to the game at the back of the room the first hints of the sunrise were beginning to show outside. A large neon sign hung over this game saying "Tron".
PB put the gold coin in only for it to be spit out onto the floor. Bending down to pick it up she noticed grooves in the floor. Intrigued by it she had Finn and Jake move the machine on its hidden hinges to find the sleek metal door hidden behind it. Finn pulled the door open and let Jake walk through to look around. Seeing nothing but a set of stairs he gave them the go ahead.
They entered and began to descend the stairs to find yet another door blocking their path this one equally as sleek as the one up the stairs. Finn slowly turned the handle and opened the door letting it swing inward soundlessly. Inside everything was covered by a very sizable amount of dust. There was a couch off to the side that probably hadn't been sat on in forever. Many faded pictures covered the walls. A diagram of what had been so boldly capped as 'The Grid' was also pinned to one wall showing a series of sectors with notes next to many of them.
There was a large laser standing in the center of the room that had PB's immediate attention along with the final object in the room, a large computer table with an ever-counting set of numbers moving across its built-in touch-screen. A leather dust-caked arm-chair was pulled up to it. Interested by this PB cleaned off the seat, sat down and wiped the dust away from the screen.
At her touch the computer woke from its long sleep mode. Curious she began to attempt to learn what this computer had inside. First, she typed the most basic command she could think of for an old computer system 'Whoami'. The computer typed out 'Flynn' in response.
"Yet another thing this Flynn owns" she privately thought to herself. Finn and Jake gazed down at what PB was doing while standing to either side of her.
After a few tries to login she succeeded in getting into the system. She proceeded to pull up the last known operations hoping to see what had been the last thing used.
"Laser Control." PB looked back at the object in the center of the room. "Now I know what you are, but now I want to know what you do."
Determined to get to the bottom of this, PB selected the laser control operation, taking note of the noise of the laser behind her turning on.
A box flashed onto the screen "activate laser yes/no." With a look back, she hit "Yes". The laser fired at the three of them. After a second of blinding light the room was empty.