The configuration of these rooms varies from casino to casino, with some having several gaming tables in one room, and some having a single table in each room. The high running costs involved with operating live dealer games is the reason why online casinos only tend to offer a handful of the most popular games in this format, such as roulette , blackjack , sic bo , and sport slots free. In comparison, the running costs associated with virtual games are very low, and it is not uncommon for online casinos to offer hundreds of different virtual casino games to players on their site. Online casinos vary in their approach to the hosting of live games, with some providing live games via their own television channel , and others offering the games exclusively via their website. In the case of televised games, players can often use their mobile phone or television remote controls to place bets instead of doing so via a computer connected to the internet. The most common live dealer games offered at online casinos are baccarat, blackjack and roulette. Many online casinos offer sign-up bonuses to new players making their first deposit, and often on subsequent play as well. These bonuses are a form of marketing that may incur a cost potentially justifiable in order to attract a new player who may return and deposit many more times , since the casino is essentially giving away money in return for a commitment from the player to wager a certain minimum amount before they are allowed to withdraw. Since all casino games have a house edge, the wagering requirements ensure that the player cannot simply walk away with the casino's money immediately after claiming the bonus. These wagering requirements are commonly set to be sufficiently high that the player has a negative expectation, exactly as if they had deposited and not claimed a bonus. Casinos may choose to restrict certain games from fulfilling the wagering requirements, either to restrict players from playing low-edge games or to restrict 'risk-free' play betting for instance both red and black on roulette , thereby completing the wagering requirement with a guaranteed profit after the bonus is taken into account. The Welcome bonus is a deposit match bonus on the first deposit ever made in the casino or casino group. Welcome bonuses sometimes come in packages and may be given to match the first two or three deposits First Deposit Welcome Bonus, Second Deposit Welcome Bonus, etc. The casino may also offer Welcome bonuses for high rollers who make an initial deposit above the standard amount limit. There are two types of Referral bonuses: one for the Referee and one for the Referrer. The Referee gets a bonus when he or she registers an account at the casino and mentions the Referrer. The Referrer gets a bonus when the Referee completes all the requirements, such as making the deposit and wagering it a certain number of times. Typically, only deposits that were not matched with bonuses count towards this bonus. You can additionally find websites that offer casino cashback payments based on your losses encountered while playing with one or more online casinos. Those type of cashback deals are usually paid back to players by the casino portal that offers those special cashback offers. The most popular form of bonus is one that can be claimed without the need to deposit any of the player's own money - known as a no deposit bonus. These bonuses are used as acquisition tools by casinos wishing to attract new players. No deposit bonuses don't always take the form of real cash, as exemplified below. Non-cashable bonuses may be called "sticky" or "phantom" bonuses. In both cases, the bonus forms a part of the player's balance, but cannot be cashed out. The difference between cash-able and phantom bonuses comes at cashout time. A phantom bonus is deducted from the player's balance at the moment he places his withdrawal request. If bonus is cash-able, then the whole balance is available for withdrawal. Comps are commonly available at land-based casinos, but also exist online.