"To aru Ossan no VRMMO Katsudouki" and "Ore to Kawazu-san no Isekai Hourouki" both involve exploring game-ish mechanics in a real/virtual world. The protagonists in each have an observation skill to assist with this.
Hard name to say, but very good mangas! "To aru Ossan no VRMMO Katsudouki". Makes me remember "legendary moonlight sculptor"! Seems promissing!