Wolfire Games extended its Humble Indie Bundle promotion -- in which gamers paid what they want to receive six indie titles, their money going toward developers, as well as the EFF and Child's Play charities -- for four more days.

So far, more than 123,700 consumers have purchased the six-game bundle (2D Boy's World of Goo, Bit Blot's Aquaria, Cryptic Sea's Gish, Wolfire's Lugaru HD, Frictional Games's Penumbra Overture, and Amanita Design's Samorost 2), contributing a total of $1.13 million, more than $350,000 of which will go to charity.

In an effort to give back to all the gamers who've bought the bundle, many of the developers have agreed to release the source code for their titles. Wolfire has already posted its source for Lugaru HD, and Aquaria, Gish, Lugaru HD, and Penumbra Overture are coming soon, too.