Clock Solitaire is a free card game developed by Grey Olltwit Educational Software that is available on Android devices. The game is a simple 1 player card game that follows the rules of patience, but is played out in a clock face pattern.

The game's objective is to remove all the cards in the deck by placing them in a clockwise order on the face of a clock. The game starts with the ace of spades at the center and the remaining cards are placed face down around it. The player then flips over the top card, which becomes the first card to be placed on the clock face. The player then continues to flip over the cards in the deck and places them in the appropriate position on the clock face until all the cards have been placed or there are no more moves left.

Clock Solitaire is a fun and challenging game that is perfect for those who enjoy playing card games. It is easy to learn, but difficult to master. The game's simple design and user-friendly interface make it accessible to players of all ages and skill levels.