I'm sure my suggestion will help poeple keeping connected to the site, especially in the morning, when only 1 or 2 players are connected. The problem is when you connect and you're the only one player, you wait until someone comes and challenge you. If you don't keep your eyes stuck on the screen, someone comes, challenge you while you're buzy with something else, wait for 15 seconds, and leave FlyOrDie. When you come back to the computer, it's too late.

If my computer would make a little sound when someone an incoming challenge happens, I could react immediately and play.

As an option the sound for incoming challenge could be offered to pay-registered players. 

What's your opinion about this ?

Nico