Win 100 boards of Pyramid for two achievements. This will not be of any concern except in some of the harder challenges. If you play a Seven to get rid of a Six, and the Seven was between a Ten and Three in the stock, the Ten and Three can now be played to each other to get rid of them.

In harder difficulties and challenges, stock and waste card order matters. Some decks may be unsolvable if the last cards in a pair are on top of each other. For example, if all four of your Jacks are in the pyramid, you need to make good use of your Twos and extremely good use of the Twos in the pyramid. If this is the case, you may want to take their opposite card into account more than usual, especially if these opposites are inside the pyramid itself. Take a look at your pyramid and identify which cards are present three times or more. This saves draw cards and makes clearing the end of the pyramid less dodgy in the end. Regardless of difficulty, you should try to use the cards in the pyramid to get rid of other cards. Try to match cards that reveal more cards over ones that don't, as you'll want to get rid of as many cards as possible as fast as possible. In endless games, you'll be able to clear as many pyramids as possible until you are unable to solve the game three times total. Only do this if you don't see any more of the two cards in the pyramid. Cards in the draw and waste piles can be matched together, which is only necessary for more difficult games, but can be nice to clear out your pile if you don't need either card anymore. You may only flip through your draw pile three times before the game ends, so you need to be as efficient as possible with what you have.

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