When you eagerly claim a massive casino bonus, the required playthrough or wagering requirement is usually heavily advertised.

Because different games have vastly different house edges, the casino assigns a specific "contribution percentage" to each game category.
Slot Machines: The 100% Contribution Standard
In almost every single online casino, standard video slot machines contribute exactly 100% toward your wagering requirements.

Because the mathematical edge favors the house so heavily, the casino is confident they will slowly drain your balance.
The high house edge of slots balances the casino's risk of giving away free moneySome casinos offer bonuses that can only be used on specific slot titlesPlaying a 0% contributing game by mistake will waste your time and bankroll The Mathematical Penalty on Skill Games
It is incredibly common for Blackjack or Roulette to contribute a miserable 5% or 10% toward the total requirement.

Many modern online casinos take this a step further and simply reduce the table game contribution rate to absolute zero.
Checking the Terms and Conditions
Before you ever deposit money to claim an offer, you must relentlessly hunt down the casino's specific bonus Terms and Conditions.

Furthermore, if you accidentally play a restricted 0% game with active bonus funds, the casino may confiscate your entire balance.
Wager AmountContribution RateAmount Deducted from Goal$20 on Slots100%$20.00$20 on Baccarat10%$2.00
Never assume a game counts; always check the specific terms and conditions table before placing your first bonus wager.