So I saw a similar thread in the GBA section of the forum.
Treat this thread as a center for suggestion on which 3DS games are Must-Play for every user at least once. I will start with my library suggestion as someone who uses 3DS since around 2015-16:
Let me know if you have other suggestions - you can also put your own essential suggestions (I look for titles to play every day but lose my mind when I have to choose)
Reason I did not put Miitopia: The Switch version is much more definitive, so it is better to play this one instead of 3DS version.
Treat this thread as a center for suggestion on which 3DS games are Must-Play for every user at least once. I will start with my library suggestion as someone who uses 3DS since around 2015-16:
- Super Smash Bros. - Staple fighting/party game, it has an exclusive Smash Run mode compared to the Wii U counterpart. Worth trying, sadly the online lobbies are currently empty.
- Pokémon X/Y - Personally I am a fan of the Kalos region, it is also the first mainline Pokémon game to have 3D and introduces features like PSS, Wonder Trade and Pokémon-Amie. (Personally it is not that bad as people often say)
- Pokémon Sun/Moon - Alola was a great summary of the Pokémon series, I think you should give it a try. PSS here has been replaced with Festival Plaza, but it still feels great with its online features. If you are a series veteran, you will like the references (Also first and probably only game to the date where YOU are the Champion the proper way)
- Zelda Ocarina of Time 3D - A remake of a classic Zelda game, but also a must play if you never played the original. I enjoyed the controls way more than the Nintendo64 version. The graphics are very nice too.
- Tomodachi Life - Known for various quirky events, it is a fun life simulator game where everyone lives in one apartment complex on an isolated island. It is funny when you add some celebrity Miis along with your friends or fictional characters
- nintendogs+ Cats - Continuation of the DS pet simulator. It has cats too, this is enough of a reason to play it.
- Kid Icarus Uprising - Widely praised by many people, especially for its multiplayer features. Latest Kid Icarus entry to date.
- Animal Crossing: New Leaf - Most popular Animal Crossing entry, keeping its shine even after New Horizons' release. I personally find the series too slow, but if you enjoy peaceful life and slow games, it is good for you
- Hyrule Warriors Legends - While not a definitive version like Switch, it is still an enjoyable Zelda-themed musou game. (Best to play on New 3DS, as on old model the game slows down a lot)
Let me know if you have other suggestions - you can also put your own essential suggestions (I look for titles to play every day but lose my mind when I have to choose)
Reason I did not put Miitopia: The Switch version is much more definitive, so it is better to play this one instead of 3DS version.