So let us get this right. You can pay what you want, and get another stack of games for your Android -- or, indeed Mac, Windows or Linux machine? And help charity? And this is actually proving very popular? Yes, Fieldrunners, Bit.Trip Beat, Uplink and SpaceChem, are the latest games to get the Humble Bundle treatment on the aforementioned platforms (the latter two are tablet-only when buying for Android). Oh, and if you're generous enough to pay above the average, you'll unlock the Spirits platform-puzzler, too. We're finding it pretty hard to argue with, especially as you get to decide the distribution of cash (between charity, the hardworking devs, or the platform-providing Humble). Judging by the real-time stats on the site, people aren't holding back on the cash, either. Still not convinced? Hop on the free-for-life video after the break to see the games in action.