Scorpion

Scorpion uses one 52-card pack. Forty-nine cards are dealt into seven columns of seven. In the first four columns, the bottom three cards are face down; every other card is face up. The last three cards are set aside as a reserve.

• Build down in the same suit: a card goes on the next higher card of its suit, such as the 7♠ on the 8♠. Nothing can be put on an Ace.
• Any face-up card can be moved, wherever it is in its column. All the cards on top of it move with it, as one unit.
• A gap can only be filled by a King, with any cards on top of it.
• When a face-down card is uncovered, it is turned face up.
• When you run out of moves, deal the reserve: one card onto each of the first three columns. (Wikipedia's rules deal it only when no more moves are possible; here you may deal it at any time.)
• You win when you've built four runs, King down to Ace, each in one suit. A finished run goes to the foundations.

• Tap a face-up card to pick it up, then tap the pile where it should go. Piles where it fits are highlighted.
• Double-tap a card to send it to a foundation, if it can go there.
• Tap Deal the reserve, or the reserve pile, to deal its three cards.
• Undo takes back a move, as many times as you like. Auto-finish sends every card it can to the foundations.

• Daily: everyone gets the same deal each day.
• New Game: a fresh deal.

100 points for each finished King-to-Ace run, plus 500 and a time bonus (up to 1,200, less a point a second) for solving the deal.

• Free the face-down cards in the first four columns early: the cards you need are often buried there.
• Moving a card takes everything on top of it, so a move can untangle a column or bury something you need. Look before you move.
• Save the reserve until you're stuck: the three cards can block columns you were about to finish.
• An empty column is worth a lot, but only a King can use it. Plan which King goes there.

Scorpion is a one-pack patience. Wikipedia describes it as somewhat related to Spider, though played more like Yukon, in which any face-up card can be moved with the cards on top of it. Its variants include Scorpion II, with three columns of face-down cards instead of four, which makes it easier; Wasp, in which any card or sequence may fill a gap; and Three Blind Mice, with ten columns of five. The rules here follow Wikipedia's description, written in our own words.

Scorpion is a free browser version of the classic solitaire card game, with a daily deal, unlimited undo and online leaderboards. There's nothing to download and no sign-up.

A free, original browser game on PlayPendium. No download, no install.