There are tiers in each humble bundle. In this bundle, if you pay a minimum of $1 you get Pixel Piracy and the other two games (low tier you can call it). If you BTA (beat the average) whatever that is shown right now, you get all the 3 games from BTA tier + games from $1 tier. If you pay $10 you get that + BTA + low tier games, all for $10. And so on, hope you get what I'm saying. Every main monthly bundle runs for two weeks time and bonus games are added to BTA tier in the second week. If you BTA now, you get the bonus games automatically added to your humble account in the second week. Let's say if you buy only the $1 tier now but current avg was $5.25 at that point of time, you get only the first 3 games of $1 tier but your order's BTA price gets locked to 5.25. You can anytime top up your order by 4.25 to get BTA content, even next week after the bonuses are revealed and even if the average changes. And the best part is, humble bundles operate for charity and using the custom slider you can split your money between developers, charity and tip humble folks as you wish!