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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.

However, players must carefully check the terms, as some specific high-RTP slots (like Blood Suckers) are often explicitly excluded.
Always read the "restricted games list" before spinning with bonus fundsClassic 3-reel slots sometimes have a lower contribution rate than modern video slotsProgressive jackpot slots are almost universally excluded from bonus play entirely Table Games: The Brutal Contribution Penalty
It is incredibly common for Blackjack or Roulette to contribute a miserable 5% or 10% toward the total requirement.

This means you would have to wager ten times the normal amount just to clear the exact same bonus.
Checking the Terms and Conditions
You must study this table carefully to ensure your favorite games are actually eligible for bonus play.

Furthermore, if you accidentally play a restricted 0% game with active bonus funds, the casino may confiscate your entire balance.
Game TypeWhy the Rate is Low/ZeroVideo PokerRTP can exceed 99.5% with perfect strategyLive Dealer GamesHigh overhead costs for the casino to operate
Wagering contributions are the casino's mathematical safety net, carefully designed to protect them from skilled table game players.