With five days to go, the Humble Introversion Bundle has already raised $652,211 thanks to 160,296 purchases.
"Introversion has teamed up with the Humble boys to bring you the deal of Introversion's lifetime," said Introversion's Chris Delay.
"In this bundle you will find all four of Introversion's classic games - Uplink, Darwinia, DEFCON and Multiwinia, as well as the awesome soundtracks for Darwinia and DEFCON."
Those that pay more that $4.07 for the bundle will also receive Aquaria and Crayon Physics Deluxe, and Window users will also get access to two Introversion tech demoes.
"We know a lot of Introversion fans probably own our games already, and we wanted to include something specifically for you guys as a token of our appreciation. We've included two tech demos created during the Subversion years that we think you will find very interesting."
As with all the Humble collections, consumers are asked to set the price, and the biggest contribution so far to the Introversion Bundle has been $1250.
A third of contributions will go to the Electronic Frontier Foundation, and the Child's Play charity.
Last month the Humble Voxatron Bundle raised $902,448.