Play coins on 3DS - maximum is 300

Did you know that you can have a maximum of 300 PlayCoins on the 3DS? Well I finished the Puzzle and Quest games on the 3DS weeks ago and I take the 3DS everywhere. I hit the maximum of 300 Play Coins the other week and have nowhere to spend them.

I do hope there is a StreetPass Quest ][ or something.

Yes ][ like 2. Not II like 2. More retro.