Humble Bundle offers downloads of the Introversion 4-Game Bundle for Windows, Mac, and Android for whatever you want to pay. If you opt to pay the bare minimum of $1, that's $34 under the lowest price we could find for downloads of these games elsewhere. It includes Uplink, Darwinia, Multiwinia: Survival of the Flattest, and DEFCON. (Only Uplink is compatible with Android.) If you pay $19.99, you'll also get Prison Architect. Your contribution can be donated to charity (Child's Play or the Electronic Frontier Foundation), the developers, or both. Deal ends August 15 at 1:59 pm ET.