If anyone's been struggling to find sets and only has an interest in getting all the trophies/Achievements, there's an app for Android that lets you write special characters like Sonic to blank NFC codes, which can be bought from Amazon for under $10 per 12 I believe. Samsung Galaxy S8/9 can use the app to write to the tags.
This works excellent, and is also a good workaround if you have a real dimensions tag that stops working. I own all the sets except the two that were limited exclusives (Supergirl and Green Arrow) so for those I did the rf tag thing.
It really is a super fun game if you don't mind all the physical swapping and movement of figures on the reader. The interactions between characters are really well done and the variety of characters is really amazing.