Idea. Challange emails or messages. also a rating system

[shancial]

so basically you could send an invitation/challenge message to your friend (non player or a veteran). if they play and put you to their friend list you can get an achievement, like a "people person" or something.


you could also make a bet that you stay as a top player in that song for 1 week or so, if the challenged friend dethrones you, you lose something, maybe an invidual rating to every player. you can bet on your rating and be the top player based on your rating!

[Pwntastic]

You could just have a bet counter of sorts. Then have another achievement if you win / lose so many bets, as well as have overly detailed statistics like win/loss ratio, predicted outcomes etc

[shancial]

haha yeah but something minor though, you dont want to overburden the servers and they need to keep the game simple too, it would be just for the advanced/interested people.