It's a game where one person (if you're playing in a lesson usually the trainer) stands in the middle of the riding arena, there's cones set up a little bit in from the rail at each of the four corners and the riders have to stay to the outside of the cones or they're out. The person in the middle calls out things to do (can be anything from basic walk-trot-canter to crazy things like trotting while sitting backwards or something depending how good of a rider you are). The riders have to do this action within three seconds of it being called or they're out. Another way to get someone out is by passing them without going inside the cones yourself. Last person left wins.
I used to ride bareback a lot on a horse I had. I never loped/galloped but I could walk, trot( he was very bouncy too ><) with no hands, eyes closed and posting.
I ride better bareback then I do in a saddle. I get lazy riding in saddles XD