So i just happend to come across this and am posting for anyone who wanna know. Anyway I was playing Super mario bros 3 on my 3ds which is a Virtual console game of the nes game, and i open the pause menu and saw the download play option. I got curious and wanted to try it out. It works well it plays as if playin the game on consle with second controller plugged in, mirroring the game on each console. Host is player one and client is player two. For a game like Super mario bros 3 where you take turns you can hold L & R button and press Y to change player controls and play with one system. It is pretty good, and wanted to share with anyone who may not have tried it yet. Now the reason for this post is the other thing i wanted to share. I currently have a 3ds with LumaCFW on it, and i wanted to try it with a different game. The one i used was Super c, I installed the Japanese version of Super C with the ciangel thing and tried to use the download play, but it doesn't work. In japanese it kept asking me to turn on the wifi connections of the system as if they were off. (It was on) So i switched it off, and said the same thing, i turned it on and it said the same thing. Basically what i am saying is download play with mis match title reigons (JAP game on USA console) doesn't function. So if anyone is able to try this or fix this, is a thing now. You never know why someone would want to do something like this but i did and i discovered this.