Pyramid Solitaire

Pyramid is a patience or solitaire game where the object is to get all the cards from
 the pyramid to the foundation.[1]

The object of the game is to remove pairs of cards that add up to a total of 13, the 
equivalent of the highest valued card in the deck, from a pyramid arrangement of 28 cards.
[2] When using the standard 52-card deck, Jacks are valued at 11, Queens at 12, and Kings 
at 13. Under the strictest rules, the odds of winning are around 1 in 50.[3]

Rules
To set up the pyramid, one card is dealt face up at the top of the playing area, then
 two cards beneath and partially covering it, then three beneath them, and so on 
completing with a row of seven cards for a total of 28 cards dealt (or six rows of 
21 cards). The remaining cards are placed to the side face down, and make up the Stock.

To play, pairs of exposed cards can be removed to the foundation if their values total 13.
 Thus, kings can be removed immediately to the foundation. In order to be removed, 
cards must not be covered, so when an Ace rests on a Queen, that Queen can not be removed.

You may draw cards from the stock one at a time and match it with any exposed card. 
If no match is made the drawn stock card is still discarded into the foundation. Once 
the stock is exhausted and/or no more pairs can be made, the game ends.

To score, count the number of remaining face up cards in the pyramid. A perfect score
 is therefore zero, where all cards have been matched into the Foundation.

To be considered won, all cards (cards from the pyramid and cards from the stock) must
 be moved to the foundation;[4] the game cannot be won if at least two cards 
cannot be moved from the stock.

Variations
Given the popularity of Pyramid, many different variants exist which alter aspects 
of the game, including the following:

Relaxed Pyramid: To be considered won, only the cards from the pyramid must be moved 
to the foundation, so the game can be won with cards still left in the stock.
Tut's Tomb (also called King Tut): Dealing three cards at a time from the stock, 
repeating until no matches can be made; placing all cards totalling 13 in a stack.
Apophis: Using three waste piles instead of one.
Giza: In a version created by Michael Keller, after the pyramid is formed, the rest
 of the deck is dealt as three rows of eight cards (i.e. eight columns of three
 overlapping cards) with the exposed cards open to match the exposed cards from the
 pyramid or other exposed cards.[5]
Triangle: The initial deal consists of an inverted pyramid.
Redeals may be allowed.
A reserve of seven (or six) cards is dealt below the pyramid. These cards can match 
each other exposed cards in the pyramid or from the stack.
Playing with a cell, filled either from the tableau or from the waste upcard.
Several variations allow a card on the pyramid to be removed in combination with a card
 covered by the first, so long as neither card is covered by a card not in the combo.
 For example, in the case of an exposed ace resting on a queen, the queen can be removed 
with the ace if no other cards are covering them, but if (for example) a jack is also on 
the queen, the queen cannot be removed. Other versions require that both cards be fully 
exposed to begin with.

When playing with a 48-card Spanish deck the highest valued cards are the Kings at 12, 
and thus pairs of exposed cards can be removed if their values total 12.

A variation of the game was released on the Microsoft Entertainment Pack 2 in 1991, 
under the name Tut's Tomb. It has also been added to Microsoft Solitaire Collection 
for Windows 8, Windows 10, Android, and iOS. When the game is played through Microsoft
 Solitaire Collection, the cards in the Stock are face-up rather than face-down.