For just a week, you can snag four retro action-shooters for any price you choose.
The latest Humble Weekly Sale includes Serious Sam HD: The First Encounter, Serious Sam HD: The Second Encounter, Shadow Warrior Classic Redux, and Duke Nukem 3D: Megaton Edition.
A payment of $1 unlocks Steam keys, and $6 nets you Hard Reset Extended Edition and System Shock 2 as bonuses.
Donations benefit the developers, Humble Bundle, and the Electronic Frontier Foundation and Child's Play Charity.
Flying Wild Hog, which made Hard Reset, is currently working on a reboot of Shadow Warrior.
