Hatsune Miku: Project Mirai DX is a pretty niche game. I mean, a music title starring Vocaloids? Every 3DS owner isn’t going to be rushing out to grab that. It may make you wonder if turning on the StreetPass and SpotPass functions are worth it. Well, I’m here to confirm that yes, yes you should.

I turned StreetPass and SpotPass on for Hatsune Miku: Project Mirai DX because it’s something I always do for new games. Even if it’s too early to conceivably or conveniently pass someone, I do it anyway. It’s a reflex. I did so and expected nothing to happen.

Then, two days later, I received a profile card over SpotPass. Because someone else on my friend’s list was also playing and had turned on the features, we had automatically swapped cards. His Vocaloid stopped by with a box bearing Mirai Points for me, and the custom jingle he created played upon Luka’s arrival.

When I visit his card in my list, I’m able to listen to his jingle at any time, see Luka in a custom pose and outfit, and watch a dance he created for "Electric Love." In fact, watching his dance even granted me two dance cards I didn’t have, which granted access to additional flourishes I could use in my own performance.

Despite never having actually StreetPassed each other since acquiring Hatsune Miku: Project Mirai DX, we were able to communicate, in a way. If alterations are made to cards, they’ll be updated the next time SpotPass data is exchanged with someone on your 3DS friend list. You can save and protect their card, so it isn’t deleted or replaced. You can also save their jingle or dance routine to your card, if you really enjoyed it. However, the dance routine will be your active character performing it, and not the one on their profile card.

It’s even possible to discern how other people are doing, based on the titles they’ve acquired and costumes their Vocaloids are wearing in the profile card. You can’t use “Puyo Poppist” in your Tagline unless you’ve played Puyo Puyo 39, for example. Some outfits are tied to songs, so you’ll know what songs someone has played depending on what clothes their characters are wearing.

Hatsune Miku: Project Mirai DX will be on the Nintendo 3DS on September 8.