Klondike solitaire is the classic single-player card game, and this free online version needs no download and no signup. The goal is to move all 52 cards onto the four foundations, building each suit up from Ace to King. On the tableau — the seven columns — you stack cards in descending order and alternating colors, so a red Six goes on a black Seven. Tap the stock in the top-left corner to draw one card at a time; when the stock runs out, tap it again to recycle the waste pile, with unlimited passes. Only a King, or a run led by a King, may be placed on an empty column, and face-down cards flip automatically when uncovered. Move cards by dragging them, or tap a card and then tap its destination; a double-tap sends an eligible card straight to its foundation. Strategy matters more than luck: prioritize moves that flip face-down cards, and target the columns hiding the most of them. Don't rush low cards to the foundations — you often need a Two or Three in play to relocate tableau runs later. Keep empty columns for Kings you can actually use, and cycle through the stock once before committing to a plan so you know what's coming. Around eight in ten draw-1 deals are winnable, so if you get stuck, use undo to retrace your steps and try a different line before dealing a new game.