Let's Make Robots!

stairs

BIG walkers

So after looking at HUNDREDS of robot projects here and with maybe 1/6 of them being "walkers," I still can't find an example of one that looks like it could climb an average set of stairs in a North American home.  Aside from the programming and engineering challenges associated with manipulating it into a narrow stairway and levelling, it seems like having a robot that could climb stairs would be an important task for it to be useful.