Solitaire Rules: How to Play Klondike, Spider and FreeCell

Klondike (classic Solitaire)

Layout: 7 columns with 1 to 7 cards each, the top card face up. The rest is the stock.
Goal: build all four suits on the foundations, Ace up to King.
In the columns, stack cards in descending order with alternating colours (a red 9 on a black 10). You can move a whole face-up run at once.
Only a King (or a run starting with a King) can go into an empty column.
Turn cards from the stock one at a time (Draw 1) or three at a time (Draw 3, harder). When the stock runs out, flip the waste pile back over.

Two decks, 10 columns. The goal is to build complete runs from King down to Ace in one suit. A complete run leaves the table by itself.
You can put any card on a card one rank higher, whatever the suit, but you can only move several cards together when they are the same suit.
Click the stock to deal one new card onto every column (every column must have at least one card).
Play with 1 suit (easy), 2 suits or 4 suits (hard).

All 52 cards are dealt face up into 8 columns, so you can plan everything.
There are 4 free cells, each holding one card, and 4 foundations.
Build columns down in alternating colours. Free cells and empty columns let you move longer runs.

Turn over face-down cards as early as you can. Hidden cards are what stop you.
Don't fill an empty column straight away unless the move really helps.
In FreeCell, keep free cells empty. Each empty cell lets you move bigger runs.
In our game every deal is checked by a solver to be winnable, and undo is unlimited.