This is an easy way to organize multiple stories in one sandbox. You can add as many tabs as you like - most people use one tab per story.
Someone's broken the door leading up to the stairwell.
…Why would anyone do that?
You approach. On the wall beside the door is a pair of hastily scribbled chalk symbols. For whatever reason, looking at them instills you with a strong sense of nostalgia… You've never seen them before.
You shrug, step through the splintered door, and move on up the stairs. Just ahead is the building containing the Way you're rather fond of using. You don't lose anything when you use it and it's only a ten-minute walk from where you work, which is pretty good, you think.
The building's front doors are slightly ajar, and another set of chalk symbols are on the wall next to them. These ones are different but, again, you don't recognise them. A shiver goes up your spine as you place your hand on the doorknob. Ignoring the increasing sense of dread, you turn the handle and slowly open the door. Your ears start ringing. You take a step inside. Your nose fills with the smell of ozone. You take another step inside. Your mouth tastes like iron. You close the door, and your head starts spinning. You brace yourself against a wall as you try to regain your bearings.
You're alone in a room. In the far corner is an analog radio sitting on a dark coffee table, pushed up against a rickety old wooden staircase leading up to the second floor. You stumble over and crumple to your knees next to it and turn it on, giving yourself a couple of minutes to get over the lingering feeling of nausea. You recognize the song that's playing, but you can't quite put your finger on it.
As your head clears you realize something. The radio isn't playing music; It's not even powered.