Shuffle pairs neighboring ranks, with King and Ace also matching, across eight self-refilling piles for a single-deck game with a fair 50% win rate.

Shuffle Solitaire is a variant of Neptune: a quick pairing game where you clear the board by removing cards of neighboring rank, and a King paired with an Ace counts too. Eight tableau piles hold one card each, and every emptied spot refills from the stock. The game is medium difficulty, with a 50% chance of winning, played with a single deck, and your odds are mainly down to chance.
If you like pairing games, Simple Pairs Solitaire and Block Ten Solitaire use the same remove-a-pair idea with different matching rules, or try original Solitaire instead.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have a good time playing!
8 tableau piles: Pair cards with neighboring ranks together; Aces sit next to Kings. Every card is dealt face-up, one per pile, and an emptied pile refills automatically from the stock.
4 foundation piles: Removed pairs are placed here. They take no further part in the game.
Stock: Face-down. Its only role is to refill empty tableau piles; it cannot be dealt by hand.
There are four foundation piles on which removed cards are arranged.
There are eight tableau piles of one card each. Every card is dealt face-up, and no building is allowed.
Any two available cards may be removed together if their ranks are next to each other, or if one is an Ace and the other a King.
Empty tableau spots are immediately filled with a card from the stock. If the stock is empty, the tableau's empty spots may not be filled.
The stock is made up of leftover cards.
Cards cannot be withdrawn from the stock manually. The stock's only purpose is to automatically refill empty tableau spots.