We've all done it - there's some downtime at the office and no one is around to see, why not play a hand or two of Solitaire?
It's right there in the desktop and so easy to just switch to at a moments notice. Hell it even used to come with a 'Boss Key' which would instantly fill your screen with some halfway legit-looking spreadsheets to make it seem like you were working if someone happened by.
And it's also one of the most popular pieces of software ever used, which is actually pretty amazing when you think about it.
The game has been a part of the Windows operating system since 1990, coded by Wes Cherry and with cards designed by Susan Kare - and it has been enjoyed by millions ever since. So Microsoft is giving it a little celebration for its 25th anniversary.
Right now, Microsoft is organising an internal Solitaire competition to find out who their best players are and in June 2015 it's going to be opened up to everyone via their Solitaire Collection version with the latest operating system.
So get practising!
(Just maybe not during work...)