Once again, you can pay what you want for up to six Android titles and in the process you can help out charity, the developers, or give a tip to the Humble staff.
Humble Mobile Bundle 4 features six unbeatable games for Android. Pay what you want to receive the legendary strategy game Catan, the free-running parkour-inspired chaser Vector, the stunt-filled hydro jet racing game Riptide GP2 and the apocalyptic sharp-shooter Zombie Gunship. If you pay more than the average, you'll also get to experience the atmospheric side-scroller action adventure game, BADLAND and form your squad in the advanced tactical combat of Breach & Clear.

Even better is a little note that says "all in-app purchases are unlocked in Badland at no additional cost." Nice. So, be sure to check out the Humble Mobile Bundle 4 right now!