So the 大逆転裁判 thing at Meiji Mura was really fun. I'd strongly recommend anyone who is able to and has any interest at all in the franchise or just trying their hand at a murder mystery adventure game in a giant outdoor museum/park. The Japanese is not especially difficult, using fairly straightforward grammar written nearly entirely as dialogue, but it's definitely not easy either. There's no furigana except for names, and there are disclaimers that while children may participate, it's really designed for adults. If you're mid to upper intermediate you can probably do fine. Lower and you'll probably be relying pretty heavily on a dictionary.
You get a set of booklets that frame the story, with dialogues between the characters which are pretty well written, in that they fit with the characters established in the games and all their quirks and tics. The story leads you around the park to a bunch of different locations, searching for evidence and witnesses (who appear in the book as written characters, not in the park). When it's time to disprove a witness testimony or something you're presented with several numbered statements. You add the number of the statement with the number of the piece of evidence that disproves it, and then look up the result in an additional book, which will give you a script indicating whether you were correct or not. It's possible to brute force it pretty easily, but of course that would ruin the fun.
When you come to the end of the book there's a big puzzle, which when solved acts as a cipher, giving you the name of the next location; go there and you find a new book with a new chapter, usually tucked in a hidden room or out-of-the-way area. These might be possible to brute force, but it would be quite difficult. You repeat this several times, and some of the puzzles are quite good. One had a real 逆転 moment, which had the whole group giddy with how clever it was.
The case is actually really good, with very colorful witnesses and interesting twists. The puzzles were of varying quality, but some were really excellent and the conclusion was brilliant.
Going through as a group with varying skill levels of Japanese, we stopped to read through each of the dialogues aloud, assigning parts to different people. I played Naruhodo and our most capable group member did a fantastic job as Susato. We helped the others with difficult kanji readings, and recapped each scene to make sure everyone was on the same page. It was super fun doing it as a group. I could have done it alone and I would have enjoyed it, but doing it like this was just really great.
It runs through the 6th of December, which is in exactly two weeks. Not a ton of time, but if you're within a day-trip's distance, it's definitely worth your time.