Gang Beasts alone is easily worth £6.50, so the fact that the Humble Indie Bundle 15 will give you another six-plus games on top of the silly local multiplayer brawler for that price is... yeah, it's quite the bargain. Also in the pay-what-you-want prize packet are X-COM 'em up Xenonauts, girl-puncher Skullgirls, and oh hey it's RPS co-founder Jimmy Ro-Ro's Sir, You Are Being Hunted. The bundle's not all sunshine and roses, but dang, it's still a fine deal.
HIB 15 runs on the usual scheme: name your own price, divide it between developers and charity and Humble as you see fit, and receive games in tiers depending on how much you pay.
Paying anything will get you the S.T.A.L.K.E.R.-inspired stealth FPS Sir YABH, first-person puzzler Q.U.B.E., a money-off coupon that'll bring Planetary Annihilation: Titans down to £10, and... ugh, Goodbye Deponia. See John's review for thoughts on why Deponia is awful.
Anyway! Beating the average price, which is currently about £4.50, will also get you fighting game Skullgirls with all its DLC, the RTS Planetary Annihilation, X-COM clone Xenonauts, and some extra mysterious games they'll reveal later.
Finally, pay more than $10 (£6.50) and you'll get Gang Beats. It's currently in Early Access, but our John already declares it one of the finest action games. We've shown Gang Beasts at The Wild Rumpus, where it drew a huge crowd of folks cheering for cutesy clayfolks tossing each other into fires and shoving chums off high buildings.
As ever, they come DRM-free for Windows, Mac, and Linux, with Steam keys thrown in too if you pay at least $1 - with a few hiccups. Mac and Linux versions of Xenonauts are still in beta, so they may be a bit ropy, and the DRM-free version of Gang Beasts will come once the game leaves Early Access.