As you can see, he has that toy (which may be the loudest toy in the universe... I covered the speaker with tape which cut the volume in half and it's STILL loud) figured out. When it's low on battery (which happens every other week) it doesn't always pop the balls very well so he knows you either have to shove them down the hole or pop them off yourself. His favorite one is purple, which he carries around all over the place. And if it's lost... well the ball popper just isn't worth playing with. The balls are not limited to being balls either. As seen in the video, they can also be food. They're also commonly used as a phone.
As for Gauge, well Lewis is just in love with him. Gauge is in love with anyone who will give him food. And since Lewis is either spilling or covered in food about 95% of the time, Gauge is never far away.
And in case you had no idea what he was doing, Lewis is debuting a new and improved kiss-face in this video. I think it's hilarious and I can't get enough of it!