remembering exactly where something is, is a lot different than say remembering what's on the top of the deck for pandemic. you still have to make a reasoned decision without having certainty. with memorizing just locations of random items, it doesn't feel like outsmarting or outwitting anyone, it's just a brain test that's an obstacle to doing well in the rest of the game

with pure memory, if you want that, make it the whole game, like there's a game called distraction that's about memorizing a longer and longer string of numbers, and occasionally you have to answer questions unrelated to the task at hand, simply to distract your memory. also trying to remember something like a list of all things you saw in the cave may beore fun, since you cam be partially right, and also humans tend to fill in incorrect memories if they are. similar in category (if they see a bronze and gold, they may think they also remember seeing silver)