Rooted !
I actually rooted it the first time because someone dropped a very sensitive file in /tmp, and I thought that was it… Stupid me, lol. Nonetheless, please clean up your workplace before leaving.
A friend of mine told me that wasn’t supposed to be the way, so I went back to try and see if I could do it without benefiting of someone else’s carelessness.
And I did ! For some reason it took me ages to get the command to work fine, but eventually I got root.
Fun box, thanks @ChefByzen !
Oh, and I agree that the name of the box is very related to the way you become root. Maybe it makes more sens in some languages than others ?