Do you know...

[Yoshi]

Hi everybody!! Someone of you can tell me what can I do with the coins that appears on 3ds?? Can I change them for a game or something like that? where?

 

[Mikaya]

The thing that would come to mind is Club Nintendo? Not sure if that that's right because coins that you earn are shown on the CN site. Coins are also used in EU, NA is stars instead. (I think)

It could be a streetpass icon perhaps? Looks like a DS so yeah. xD

 

[numage]

It is a coin from when you put your 3ds in a sleep mode and walk around. You can use them to purchase a game/options in the AR card games section. Some 3ds games also allow you to use the coin in-game eg. Animal Crossing (buying fortune cookies). You can also use it for the streetpass games like collecting puzzles and save Mii.

 

[18]

They are used in various games to buy in-game items, although not all games have it. An easy example is the StreetPass Mii Plaza games. You have a lot of them; 10 Play Coins are generally good for getting valuable items in some games

 

[CJ]

Those coins are known as Play Coins. You earn them by walking 100 steps and you can earn a maximum of 10 in a day. The maximum limit is 300 and they can't be used to purchase games (otherwise I would be rolling with games ). You can buy in- game itens with them. For more info, go here- http://nintendo.wikia.com/wiki/Play_Coins

 

[the great]

Na, you can just buy (or rather "get") in-game items such as SSB trophies, acnl fortune cookies nd different kinds of items in Streetpass Mii Plaza. Wish we could buygames with them. Those coins are irritating me.

 

[shadowharold]

They are worth nothing, only a handful of games use them to unlock stuff.

 

[Danny]

Those coins are used in to buy various item in mii street plaza and you can those coins when nintendo is in sleep mode and you walk around with your nintendo. You can 10 coins a day. This may help you.

 

[Ichimaru]

Not really that big of a deal but getting coins thing it is a pedometer so the number of steps you take will be shown on the upper screen when the coins are not there.It takes 100 steps for a coin,you can get 10 per day so have fun with them.

 

[2071]

Those are called play coins , though not to mistaken them with this site's currency . I find them pretty fun to earn and they are used to buy in-game stuff like in the Street Pass Mii PLaza for the games Find Mii and Puzzle Swap . Not much games use this feature but it is something so too bad you can't exchange them for let's say 300 Play coins for 1 dollar in the eshop that would be cool though

 

[3391]

I wish they did more with them

But as others have said it's used for a select few games to buy items or help you in-game.