Spider solitaire

1. The game uses two decks: 104 cards. 54 start in 10 columns with the top card face up, and 50 wait in the stock.
2. Put any card on a card one rank higher, of any suit: a 6 on any 7.
3. Move a run of cards as one only when the run is all one suit, in order: 9, 8, 7 of spades.
4. A full run of one suit, from king down to ace, leaves the table by itself. Make 8 runs to win.
5. When you are stuck, tap the stock to deal one new card onto each column. A deal needs a card in every column. The stock holds 5 deals.

With 1 suit, all 104 cards are spades, so any run in order moves as one. It is the best way to learn the game. With 2 suits, the cards are spades and hearts. With 4 suits, the two decks keep all four suits, and a run of one suit is much harder to build. Your best time stays in this browser for each choice.

• Phone and tablet: drag a card and the cards on it, or tap it to send it to its best place, a card of its own suit first.
• Mouse: drag, or click a card. A double click moves it once.
• Keyboard: the arrow keys move the blue ring. Enter sends the cards to their best place, and Space picks them up and puts them down. D deals a new row, U undoes a move, and H shows a hint.

• Build in one suit whenever you can. A run of mixed suits looks good but cannot move as one.
• Turn over face-down cards early, starting with the columns that have the most of them.
• An empty column is your best tool. Use it to sort a run, then fill it again before you deal.
• Before you deal, make every move you can. A deal covers each column with a new card.
• Undo has no limit. Try a line of play, and go back if it leads nowhere.