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i think you found the rock :D it was 5AM when i seen the post and i didn't want to pass on the answer. but i did not manage to find the rock.

It wasn't too far from the obvious, hahaha. Just needed to find the same shape, which is always fun!

Congrats @rinicane! You won as you got it spot on and first!

Woohoo! It was real fun @benwickenton, thank you for the game.