Khet and Quarto, are games of what type?
Quarto (board game) Quarto is a board game for two players invented by Swiss mathematician Blaise Müller in 1991. It is published and copyrighted by Gigamic.
Tic-tac-toe Tic-tac-toe (also known as noughts and crosses or Xs and Os) is a paper-and-pencil game for two players, "X" and "O", who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game.