Although the required deposit amount varies from platform to platform, it is frequently designed to entice new players to participate in the game. For example, certain wonline slots bingoebsites might offer tiers of bonuses according to the amount deposited, while others might require a minimum deposit of $10 or $20 to unlock the bonus. Extra Conditions. To completely unlock the bonus, players might also need to complete a specific number of games or reach particular game milestones in addition to the initial deposit.