Solitaire Club Online offers the most popular Klondike Solitaire variation.
The goal in Solitaire Club is to build four suit stacks on top starting with aces 2s 3s and so on all of the same suit.
You can use 7 vertical row stacks as temporary holding areas where cards have to be placed in descending order and have to alternate between red cards and black cards.
The bottom card in each vertical row stack has to be a King.
You can move more than 1 card at a time for example by dragging several cards at once from one row stack to the other. You will continue playing until you build up the 4 suit stacks on top.