Well then,on to some suggestions.If you're one explorative type,I think Luigi's Mansion 2(Dark Moon in America) is a nice alternative.It isn't brought up a lot,and I saw that most fans of the original Luigi's Mansion from the GameCube didn't think it was as good as that one,but as a new player,I thought the sequel was fun.There are some funny moments,some tense moments,some exploration moments,and if you're searching for a game that'll keep you in search of most of its content,here it is.
Another one I think is underrated,more so than Luigi's Mansion 2,personaly,is Rhythm Thief and the Emperor's Treasure.Think of a game that is essentially Elite Beat Agents mixed up with something like The Adventures of Tintin and/or Professor Layton(which I also suggest as great mystery/puzzle games,although I haven't played the 3DS games for a while as of now
),and Rhythm Thief is the result that came out of it.It's a combination of a point-and-click navigation and rhytym minigames,and it plays greatly for its relief.You like awesome music?This game will have you taping your toes a lot,and probably make you want to dance.How about something to move along with it?There is a story to motivate all of it,and it also stands out here.I could choose to say more,but I think I said enough for now.To speak shortly,this game is great,and I recommend it as an underrated title amomgst the 3DS library's greats.