User:Check behind Mettaton's house.

BEHIND HIS HOUSE.

A secret! Oh yes a fabu-ful secret! (Or maybe not?)

No key I know the way in, I got 3 kind o' keys! Sans' key, workplace key, and mettaton's house key! But yet a door is locked somewhere I must find it, I must!

I will one day find out whether hacking is the option or am I missing a clue? Do two doors open after the credits instead of Toby's? Maybe not.

He must have a big secret if a key is nothing we should all be looking for.

Maybe someday, it's my turn. But that could be days, weeks, months.

Some of us...

Cant do so...

Until a very long time.

Probably for the best?