A wagering requirement (or playthrough) is the number of times bonus funds must be wagered before they can be withdrawn as cash. A 30x requirement on a €100 bonus means wagering €3,000 before withdrawal.
Wagering requirements significantly affect the real value of bonuses. Higher requirements make it harder to convert bonus funds to withdrawable cash and should factor into bonus evaluation.
A player receives a €50 bonus with 35x wagering. They must wager €1,750 total. If slots contribute 100% and table games 10%, they need €1,750 in slot bets or €17,500 in table game bets.