

Uses 1 pack of cards.
A Cell provides temporary storage for any single card.
Four Cells are available, and are occupied at the start.
A card can be played from a Cell to either the Tableau or Foundations.
The number of "free" Cells determines how many Tableau cards can be moved as a group.
The game is won when each Foundation Pile shows a King:

Only one card at a time may be played to (or from) a Foundation Pile.
Only an Ace can be placed on an empty Foundation Pile.

Build each Foundation Pile in ascending value from Ace to King, with all cards in a Pile sharing the same suit.

The Tableau Stacks are used to manage and store cards, before they are eventually moved to the Foundations.
Build each Stack in descending value and alternating color:

Only the front-most card of a Stack, or the front-most valid group of cards can be moved. A valid group is an unbroken sequence of cards in descending value and alternating color

The number of cards that can be moved as a group depends on the number of free Cells. You can move one card plus the number of free Cells.
For example, if there are two free Cells, then up to three Tableau cards can be moved as a group. (As long those three cards build down in value and alternating color.)
Only a King may be placed on an empty Stack.
Only a group headed by a King can be moved to an empty Stack, and must build down in descending value and alternating color. The number of cards is limited by the free Cells rule described above.

Try to keep as many Cells free (empty) as possible.
Free any Aces and other low-value cards buried in the Tableau Stacks.