Pyramid 13 is a fun and challenging variation of the classic solitaire game. The game consists of arranging cards in multiple rows in the form of a triangular pyramid and selecting pairs of cards with a total value of 13 in order to remove them and make your way to the top. The game is available on the Android platform and is completely free to download.

The goal of Pyramid 13 is to remove all 28 cards (21 on 'Easy' difficulty) from the pyramid of cards. The game offers four difficulty modes and allows the player to draw one or three cards at a time. Additionally, the game offers a time bonus for quick matches and allows players to undo their previous moves. The game also has a feature that provides hints on available pairings and has customizable backgrounds and card backs. Pyramid 13 can be played offline and does not require any login.