Sticky Bonuses use promotional value that is not normally withdrawable as cash in the same way as a cash balance. Depending on the offer, the credit can remain available for wagering while the original bonus amount is removed at withdrawal, or it can sit inside a restricted balance until a stated play-through condition has been satisfied.
The word sticky is not implemented identically across operators. Some promotions combine deposited funds and promotional funds in a restricted balance; others use the term more narrowly for a non-cashable bonus amount while allowing qualifying winnings to become withdrawable. Current casino bonus systems also distinguish locked winnings from freely available cash, showing why the composition of the balance matters.
A useful reading of the offer therefore separates the deposit, promotional credit and winnings rather than treating the displayed total as one cash balance. The terms should state what can ultimately be withdrawn, which funds are used first, whether wagering releases or merely consumes the bonus, and what happens if the promotion is cancelled. Those mechanics determine the practical effect of the sticky feature more accurately than the headline bonus percentage.
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