Other definitions "A game is a system in which players engage in an artificial conflict, defined by rules, that results in a quantifiable outcome. Alternate reality games ARGs can be massively multiplayer, allowing thousands of players worldwide to co-operate in puzzle trails and mystery solving. Some games, such as chess and Go , are entirely deterministic, relying only on the strategy element for their interest. Flip over two cards, if they match they will disappear, if they don't These cards may be a standard Anglo-American card deck of playing cards such as for bridge , poker , Rummy , etc. These games vary widely, from games centering on a design being drawn such as Pictionary and "connect-the-dots" games like sprouts , to letter and word games such as Boggle and Scattergories , to solitaire and logic puzzle games such as Sudoku and crossword puzzles. This is called the turn. He believes that teachers have a vital role to play in ensuring that children understand not only the potential rewards of gambling but also its risks. Many sports require special equipment and dedicated playing fields, leading to the involvement of a community much larger than the group of players. These games and others, as they require reflexes and coordination, are generally performed more poorly by intoxicated persons but are unlikely to result in injury because of this; as such the games are popular as drinking games. Chess pawns, marbles , Monopoly tokens, dominoes , Monopoly hotels, jacks and checkers pieces.