9 [Similar Anime] Like Fastest Finger First

While Baka and Test really only has a quiz show element during the last episode, the entire show over all treasures knowledge above all else just like Fatsest finger.

Anime about sports that aren't physically demanding, but require fast reaction times and understanding the game to truly excel. Competition vibe is similar and both have the details of the subtle things one can do to improve their ability.

Sports anime with a passionate and usually energetic protagonist, with bright colors and overall a very light mood. Most of the matches in 7O3X are individual, but the practice team matches bear close resemblance to the ones in Haikyuu. Similar pointy character designs.

Both animes aren't the most similar in genres, i guess, since one is centered on rock climbing and one is on quiz bowl, but the two anime have a similar vibe/feel to it.

In both animes you will have games and hobbies as the main topic. School clubs are the places these game-otakus will meet.
While in D-Frag! the gaming club already exists and shows on a hilarious way their obsessions with everything related to every existing game, in NMSB they want to resurface the quiz club. It's very interesting the fact all the characters in both animes particularly have different interests but an objective in common.
D.Frag! is funnier than NMSB but both really enjoyable.

Phi brain is about puzzles

The characters of both anime have an extensive horizon in the knowledge of literature and other arts. They share this knowledge. In Nana Maru San Batsu answering questions in quizzes, and in Bernard-jou Iwaku. Shiori Kanbayashi discusses with the girlfriend Sawako Machida the facts of the books, light novells, manga, mentioning the related films and anime, from well-known authors.

Hyouka shares with Nana Maru San Batsu the underlying theme of how individuals deal with information. Instead of taking a competitive spin on this, Hyouka takes the detective-genre route. It is still about everyday high schools who take apart questions that don't seem to be like a big deal and try to come up with satisfying answers. This time however, the questions aren't coming from quiz booklets but from the students themselves.

Both involves characters being recruited by a very persistent female character to join the club where it competes for honor prestige and money.