As promised by the Humble Indie Bundle, Cryptic Sea has released the source code for Gish, the winner of the Independent Games Festival's Grand Prize and Innovation in Game Design awards in 2005. This 2D platformer stars a ball of tar named Gish that can climb up walls, squeeze through pipes, and more, thanks to his gelatinous structure.

Cryptic Sea's Alex Austin admits, "Most of this code was hacked in in the last 3 or 4 months of development, so it's not very clean." Still, it's great that you can hack around with the Gish engine now and create whatever mods you want

The Humble Indie Bundle, which was a charity event (for Child's Play and the EFF) that was held last month and raised $1.27 million, offered to make several titles open source if enough contributors purchased a package of six indie PC games for however much they were willing to pay.

So far, the source code for Frictional Games' Penumbra Overture, Wolfire Games' Lugaru HD, and Cryptic Sea's Gish have been posted. Bit Blot (Mossmouth's Derek Yu and Infinite Ammo's Alec Holowka) plans to release the source for IGF 2007's Grand Prize award winner Aquaria soon, too.