The 3DS has been subject to many homebrew exploits with games. You might remember Cubic Ninja was all the rage at one point for being able to run a homebrew exploit which caused the game to skyrocket in price. More recently, Citizens of Earth had the same issue as well on the eShop.
Another game has been found to access a homebrew exploit, this time it’s Freakyforms Deluxe: Your Creations, Alive! The game has been temporarily removed from the 3DS eShop due to this, but will be back soon hopefully. It’s interesting to see how this issue is coming up more and more often lately for the 3DS, but at least Nintendo is doing a decent job of fixing the issues.