So JYPE released an app for GOT7 which is essentially like Tap Tap Revolution, but with their songs. Unlike the SM app, this one seems to be open for download worldwide! (it at least works for me here in Canada.)
I'm having fun playing, maybe it's something you want to try out too!
As a side note, I am liking whoever is in charge of managing/marketing GOT7 as a group. The GOTOONs are such great branding for the boys, stays consistent, and always relevant. I was also impressed with the A promotions (with the chips granting you access to various events -- obviously will raise sales because fans want to attend allllll of them). And now with this app, they're basically making you go through lesser-known GOT7 songs and playing each one multiple times before you can move on to the title track that everyone knows.