S.W.
Time to move him out of the crib... I had to move mine out at a year because they could climb out, you are lucky he made it that long. lol... It seems frustrating but I think its time for a new bed. Some like the toddler beds, I personally went straight to a twin bed with a rail, this way they had their bed that they would have trough the school years and I could read stories and snuggle with them. If they did get up in the night then I would lead them back to their bed shut the door and walk away. Repeating the process dozens of times sometimes. Unfortunatley its a phase that he has discovered he has some control over and is trying it out to see how far he can get with it. Just be firm but loving. Let him know you are there but its bed time and that that is where he is to stay. He will soon get it. He may even be so excited about the new bed that he won't get out lots... who knows.
Best of luck,
S.