Fifteen Puzzle Solitaire is a free solitaire game developed by AlgoTech for Android devices. Unlike traditional solitaire games, this game is played like a puzzle. The player is dealt all 52 cards face-up in 13 piles, each with 4 cards. The objective is to move the cards around so that each pile contains 4 cards of the same rank.

The rules of the game are simple: only the top card of each pile is available for play, a pile can only have a maximum of 4 cards, and a card can only be moved onto another card of the same rank. Empty spaces in a pile can be filled with any card. While easy to play, the game is difficult to solve, making it a fun and challenging experience.

Fifteen Puzzle Solitaire has several features to enhance gameplay, including the ability to save the game state to play later, unlimited undo, and gameplay statistics. Overall, Fifteen Puzzle Solitaire is a unique twist on traditional solitaire games that is both challenging and enjoyable.