I struggle to think of many games that have the kind of secrets this game contains, though that doesn't mean it has anything that extreme, compared to Arkham Asylum.

There are a bunch of hidden collectables hidden around the hub world, which is interesting and not that abnormal, but there are also collectables hidden in the multiplayer maps. Hidden switches that need to be activated, which then trigger something on the map to reveal a collectable. Tricky, hidden or out of bounds areas that also hide collectables. Seemingly normal surfaces that can be broken open.There are some switches and a puzzle that nobody has figured out yet. Most multiplayer games don't do this.

Have you found anything you thought was interesting so far? Every inch of this game feels crafted by a team that cared, and didn't need to do nearly half of the things they have done. It's weird. Really weird.

My favourite so far has been the rear end of a fish sticking out of the wall, on top of a building you can't normally reach, which you can interact with. It's part of a larger quest but seemingly completely random.

There's a TON of secrets in this game, including some crazy puzzles. I love stuff like this!

@xbob42: somebody on reddit figured out the 'big' puzzle in that game in the last day, and it's pretty impressive. I feel so lazy because I'm just copying the solutions. I know I would never put in the time to figure them out.

I loved all the secrets in the backyard stuff and I appreciate that other people put in the work to solve them for me and find all the gnomes. Makes it much less tedious for me to search for everything but I appreciate the lengths the developers went to on some of these puzzles. Especially the secret room in the Gnome hall where you have to select the symbols in the correct order. Also, doing the fish thing in the correct order is crazy and I don't think I would ever have figured that out on my own. Some good rewards though, especially for finishing all the gnome stuff and getting into that secret room.