shell crypt
EVERY HN game has puzzles and is mostly puzzle based, that is every game but SN. It would make gameplay more interesting if every map had 1 or 2 simple puzzles, maybe a combination lock to a door, and the combination code can be found around the map, maybe switches you have to switch in a certain order to open a gate. These puzzles would also slow the game down a little, because the game is so easy to speedrun and just complete way too fast. Note: take in consideration though that the puzzles would need to be adapted for multi-player, meaning puzzles that need special items or something wouldn't work, the neighbor could just sabotage and hoard the items.
tepid oxide
minor lodge
fallow knot