i highly recommend the solitaire game The Game
it's so incredibly simple, the rules are actually easier to understand than Klondike, but it has such a beautiful strategy. The concept is that you have numbered cards, 2-99, and you have to play all of them to win. You have four piles you can play them in - two that can only decrease, and two that can only increase. It's against the rules to play them out of order.
You also have a small hand of cards you're playing from, and you can only draw up from the deck every two moves at the earliest.
The trick?
If you move *exactly* ten numbers in the wrong direction, it's allowed. So in the descending pile, you can play a 45 on top of a 35 to turn back time, and delay your fate, hopefully allowing you to play some cards in the gaps that you missed the opportunity to put down.
There's also a non-solitaire mode, where you team up with up to four other players, and the bonus trick there is that discussing strategy is against the rules - so your friend might have the 14 to turn back time on that descending 4, but you might screw up their plans because you don't know that. You have to read your friends, and work together to beat the game.
It also comes in two colors - artsy and edgy.
Highly, highly recommend it as a way to pass the time these days.

also there's an app
aaaa so close

@V Where does one obtain this app?