Ah! Forgot to mention the weirdest game I met so far!!! It's the Neoclassical Geek Revival! Really a different game!
...and if you are not english native, it will be even a good exercise in reading comprehension!
It touches so many elements of fantasy while also nudging players towards a more narrative experience where social interaction carries so much more weight than combat.
Not an RPG, but a module: The 2018 edition of Masks of Nyarlathotep, which is two hard-cover books and a "book" of player handouts.
I have the first edition of Masks but never ran it. Decided to start up an online play of the game and saw that the new edition was out for CoC 7e, and got it from Amazon for a decent price, and was blown away when I started reading through it. It is hands down simply a great gaming product. Worth every penny. It has made the adventure so much better than it probably would have been just using the 1st edition of the module. And it makes me want to run it a couple more times. And even if I wasn't running it, still also a good read.