Simple! Easy! The rules are simple – if you had a skyscraper floor, what would you put in it? Why would it be special? Etc! 1st person does Floor 1, next Floor 2, and so on!
Post your posts like this:
Floor #
This floor is home to bla bla bla. Why? Because yadda yadda yadda yadda yadda. Also, it has yabber yabber yabber yabber yabber. It also has yeah yeah yeah in it. Nah nah nah.
Floor 1
This floor looks like an ordinary hotel lobby by day. At night the laws of physics become rather malleable.
This Floor has a lot of doors/gates/whatever. May you be lucky to not encounter the gates of truth. Armor games is not responsible for any attacks of insanity after you discover the truth.
This floor is possessed by demons. They plan on how to prevent the Skyscraper from reaching 1000 Floors and thus munging the prophecy up. Their first attack was causing a glitch on Floor 976, but there's more to come. Now they have a break from plotting and every visitor is welcome to play some friendly Ouija with them.
This floor has a device that can hack into anything. When I say anything, I mean not just machines, but living things and objects. The scientists are still trying to figure out how to make it able to hack into demons.
This floor contains an army of imps summoned by demons. They plan to strike at Floor 981 to prevent scientists from discovering their masters' vile plans. For visitors imps shapeshift into servants and serve an abundance of delicious food.
This floor has these stupid guys, AKA pranksters. They can't control their pranks that might eventually cause the building collapsing. Visiting here expect to get attacked by the worst sorts of pranks and then hearing: "It's just a prank, bro!" and everyone laughing like nothing happened. Lots of fun, for viewers.
This is a big warehouse crowded with building materials, construction equipment, and bustling workers. Cranes lift supplies through large portals in each corner of the room. A dozen crazed architects constantly bicker in front of an incredibly long blueprint, furiously scribbling over each other's work while a hagard looking foreman tries to explain that there have been some major delays, apparently due to a series of tasteless practical jokes by unknown parties.
A nearby freight elevator gives access to the next floor.
This floor arised thanks to both ingenious building crew from the Floor 986 and magical powers from the next one. It is a huge embassy. Representatives from all of the previous floors sit at assigned desks, receiving guests or visit other desks accoriding to actual needs of their native Floors.
This floor makes you feel a great need to reach floor 1000 whenever you are in it. When you leave, the feeling is gone. But if you go straight up to floor 1000, when it gets built, all your dreams will come true.
This floor says that 999 being the demon's number upside down is a good thing, because, just as Christ's cross upside down is a devil's symbol, the devil's number upside down is God's symbol.