The latest Humble Bundle doesn't have a number. Instead, Humble Bundle Inc. has decided to refer to the compilation of indie game as "Jumbo." It's an apt title.
The Humble Jumbo Bundle is a Steam-only collection. You can pay as little as $1 if you want. The average purchase price is currently $3.88. The highest purchase was $999.99. Proceeds can be split between Hundle Bundle Inc., the developers, and the charities Watsi and Child's Play. You can split your money whatever way you want between these parties.
As long as you pay $1 or more, you'll get access to three games: Natural Selection 2, Sanctum 2 and Magicka. Natural Selection 2 is a marines-versus-aliens multiplayer shooter. Each team has a player commander that can support their teammates by using special abilities, researching upgrades, or constructing helpful buildings. Sanctum 2 is a first-person shooter/tower defense game, in which players must defend power cores from rampaging aliens. Magicka is a four-player co-op wizard adventure. The Humble Jumbo Bundle also includes its two DLC packs, Dungeons and Daemons and Vietnam.
If you pay more than average, you'll also unlock three more games: Garry's Mod, Orcs Must Die! 2: Complete Pack and Serious Sam 3: Beyond First Encounter. Serious Sam 3: BFE is a retro-style FPS that asks players to defeat hordes of enemies with nothing but a rocket launcher, minigun, assault rifle, a chainsaw and a few other weapons. Orcs Must Die! 2 is another tower defense game, in which 1-2 players fight off waves of greenskins with magic and traps.
Garry's Mod is a different beast entirely. While it's technically a game, there's no actual objective or narrative. Players use objects from various Source engine games and putz around to their heart's content. The player community has built many mods over the years that allow players to roleplay, engage in aerial dogfights and more. It's like owning several games in one.
Another reason to pay more than average for these games is that Humble Bundle Inc. tends to throw in additional bonus games about a week after each collection goes on sale. If you're still on the fence, it might be worthwhile to hold off until next Tueday to see what they add.
All six games in the Humble Jumbo Bundle are playable on PC. Natural Selection 2, Garry's Mod and Serious Sam 3: BFE are also available on Linux. Mac players will be able to play Garry's Mod and Serious Sam 3.
The bundle's off to an impressive start, earning $250,000 in the past few hours. It'll be on sale for two more weeks so it'll almost certainly pass the $1 million mark before then.