It's definitely an old classic, but one that needs a revival. 
 
In a world of technology and social media, stepping away and challenging yourself to a good puzzle is a great way to relax and pass the time. 
 
This doesn't really need an explanation, but I'll give you one anyway. 
 
You have ten discs… Even a blind person can get nine in the space, but can you find a way to fit in that tricky tenth piece?  It looks easy, but the reality is very different indeed! Why don't you time yourself and we'll put together a leaderboard?
 
And no, you aren't getting any clues from us…