Yukon is a complex game that is easy to play once you get the hang of it.
The goal is to move all the cards to the foundations in ascending order by suit.
You can grab one or a set of face-up cards from the tableau and move them to another tableau pile, as long at the first card in the set is one less in value and of opposite color than the top card in the tableau pile.
When you dig down to a face-down card in a tableau pile, you can click it to turn it over.
When a tableau pile is empty, you can move any card or group of cards to fill the space.