Hi hun,
DS has been through this stage with naps many times but he does usually go back to napping if we just keep consistent.
How long has your lo been in a bed? Do you have a stair gate on the door?
Does he have a gro-clock you could set for naps?
If he is treating it like a game then tbh the less contact with you the better so if there was a stair gate I would just put him in his room and then decide on the length of time i.e. 1 hour and leave. Unless he is very upset I would just leave him to it, maybe once he realises there is no contact he will just settle down especially if he does it ok for other people. My lo would get very upset so that was more tricky and then I would do WIWO although he was in a cot the last time this happened so a bit easier.