Holland and Spain are also popular for the roulette games and roulette casino. In Holland single zero wheels are popular and there are set of rules with respect to the zero slots. In Holland casinos if zeros occur in two consecutive spins then the bet money is considered to be double imprisoned. In double imprisonment case there should be two winning bets to release the prize money. If anything other than a winning bet occurs or a zero occurs again then the money is considered to be permanently lost. The house edge for these boards in Holland is around 1.37%. There is also an option of getting back half the money if the player wishes to close the game and be on the safer side instead of losing the complete money. In Spain the zero rules are stronger; there are even options to lock the money for more number of times when a zero occurs on the board. Also, similar to Holland there are rules like if there is n number of landings on zero then there should be n number of releases required to get back the money into the game from the imprisonment. It is to be noted that house edge for this kind of rules comes to 1.37%. la roulette en ligne is also widely popular.