Stair stepper

We have stairs in our house but they just lead up to the bonus room so we don't use them a lot. We have had a gate up ever since Cort started thinking about crawling so he has never really discovered them.
At my parents house last weekend he discovered them and climbed all the way to the top with NO HELP!!!! We, of course, kept our hand right under his little toosh the whole time but never had to help him. He would occasionally slip back down to the previous step but would just keep on steppin'! He was so proud of himself.