Shadow Solitaire is a free Android game developed by Pozirk Games Inc. that offers a unique twist on the classic solitaire game. The game requires players to link cards together by matching them with cards of higher or lower rank, filling in shapes on the screen. However, there's a catch - players only have two decks of cards for each puzzle, and reshuffling is not an option.

The game features 60 challenging levels, each with open squares on the board that might have suit symbols on them. In that case, players must play a card of appropriate value and suit. Shadow Solitaire also offers a global leaderboard, allowing players to watch their friends and competitors. The game has attractive graphics, and the relaxing music and sound effects make for an enjoyable experience.

Overall, Shadow Solitaire is a unique and challenging take on the classic solitaire game. With its unusual gameplay and challenging levels, it's a great choice for anyone looking for a fresh twist on a classic game.