In the past, people only knew two general kinds of games - indoor games and outdoor games. Included in the list of indoor games are those that are played under a roof such as scrabble, chess, puzzles and others while outdoor games such as football, soccer, volleyball, baseball and others require either a ground or a big field to play. Do you now that in the earlier times, these indoor and outdoor games also did not exist? However, because people keep on looking for something new, different kinds of gambling were developed.