Make sure to visit the Gauntlet Runner every day after you unlock it

[jbkilroy]

There are 3 unmarked doors in the hallway.

One is the pantry, which gives you two cooking items. That's logical.
Second is the washroom, which gives you a small amount of xp for... washing your face? That's pretty weird.
Third is the toilet. On days ending in 5 or 0 using it will give you a permanent +1 luck, because you left what you didn't need behind?? Makes no sense at all.

Anyway, you can visit each room once per day.