H.S.
Get a baby gate with vertical bars only. It is much harder to scale them ... my 3 year old and almost 2 year old are both climbers, in fact, my daughter had to be taken out of her crib and put into a toddler bed around 15 months old because her big brother would climb in the crib and make monster growling noises at her and scare her into trying to climb out, but she would get her knees (how, I don't know) stuck in the slats and scream. One option we tried with my kids to keep them in their room is putting door knob covers on the inside of the door and leave a few toys for them in there, as well as a pillow and a blanket so if they get sleepy then can just lay back down.