Simple game with a part of the proceeds going to autism charities.
Peg Solitaire (also known as just Solitaire in the UK or Brainvita) has very simple rules. The goal is to remove pegs from the board by jumping over each peg with another peg; this removes the "jumped" peg (similar to Checkers jumps). Click or drag (option) to move a peg. Only horizontal and vertical jumps are allowed. The game is over when no more jumps are possible. You win the game by removing all the pegs except one from the board. A perfect game would leave one peg in the center position.