List of hidden levels or secret levels, in the Nintendo Switch funko fusion

As of my last knowledge update in October 2021, there wasn't a specific Nintendo Switch game titled "Funko Fusion." However, if you are referring to a game that features Funko characters or related content on the Switch, it may have been released after that date or have a different title altogether. To get the most accurate information on hidden or secret levels in the game you’re referring to, I'd recommend checking gaming forums, official game guides, or dedicated game websites for the most recent insights and player experiences. If you meant a different game that features Funko Pop characters or if you have more details, please let me know, and I’d be happy to help further!