Moving toddler to big bed

I saw thre was another post similar to this but didn't want to hijack the thread. We are up to day 2 of the transition of moving our two year old from cot to a big bed. He has always been an awesome little sleeper and did really well with the sleep last night. Now up to the day sleep and it's a total disaster! He keeps getting out even though he was super tired and asking for bed. I have put him back about 20 times and he just thinks it's a big joke. He also thinks my growly voice is funny. He has always slept with his door closed, so left on his own he is happily getting up and playing in his room. What do you guys think the best approach is? Try sitting in his room til he goes to sleep? I think he will see that as some kind of game as well!

We've transitioned our 16 month old to a bed just before Christmas (he was 14 months).
We use a sleeping bag for all his sleeps in his bed - which limits how easily he can get out (though when he really really wants to he manages it). When he's tired, he'd often sit up and then just lie back down again.

Day sleeps, I was sitting in there for a few minutes and then leaving, telling him I'd be back in a minute, and then literally going back after a minute, and saying it again, slowly stretching it out. It seems to work

Good luck!!

There are recommendations of keeping a child in their cot for as long as possible - up to the age of 3yo unless they are climbing over cotrails and it's a physical risk to their safety.

If that's the case, there are a couple of things that you can do... one is trying a sleepsack to give them that extra feeling of security and more difficult to hop out etc. but it's hot this time of year. Another is trying the safety sleep (safe-t-sleep?) belt but i'm not sure i'm a big fan of them. Another is sitting with him till he falls asleep. If you do that, you have to be careful not to engage in conversation with him even to say "lie down and sleep now!" - once you've said goodnight and bedtime, that's it - no more conversation. Your sitting next to the bed helps them to transition to what feels like a big change and to let them know that change is ok.

Sometimes toddlers start to drop their afternoon sleep as well - obviously he is more awake in the afternoon than he is in the evening so he has more energy to test the boundaries of his newfound freedom! It's definitely a tough stage for up to a few weeks or as few as a few days. I have coached a number of parents through this stage and you're certainly not alone in finding it difficult!

Usually it's because baby #2 needs the cot that child #1 is given the "big boy bed" and I'm assuming that's the case...