[quote=@malmshodes]
Okay so here's my idea
We'll start out in our own world, as ourselves.  Everything is normal until these spheres start showing up out of nowhere.  They'll just pop into existence and then vanish, along with whatever was locating the space.  From there our characters will find ourselves in something like a hub world that's encased by a glowing wall of light(similar to the spheres) and we'll learn from someone in the city that there's no way to predict where we'll end up next so if we'll just have to walk through and keep going from world to world till we get home.  

As for abilities I think, in the hub City, or world, a group will approach us and they'll be the ones who'll explain whats going on.  From them we'll learn that the coins we've found in our pockets(four of them) are a specially form of currency that could be used to acquire abilities from them.  So we'll get a list of abilities and be able to pick out a maximum of four.  Not sure if there should be abilities that cost more than a single coin though.  Anyways, don't worry about having to pick skills from a set because that's not the end.  Naturally, we'll gain new powers and abilities as our characters progress through the worlds.  It's just that the abilities we buy will always be with us, as the abilities to use certain powers change with the world's we find ourselves in. 

Honestly, not too sure what kind of system we'd use for the other powers we'd gain from our travels so if anyone has any ideas on that share, please. 
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Well, you said the first time we teleported, we gained the four coins, right? Why not have it so after a teleport, you gain a coin. That was what you meant by "other abilities gained from travels," right? 

Also whatever's going on here, call it a tentative interest, like Spoo.