Requires Amazon Prime. Ends 5/1. Amazon's Prime Gaming has Wolfenstein: The New Order (PC) for $0 downloaded (GoG). Rated 81% on OpenCritic. Also free this month (scroll to bottom of this page):

• Available now: Ninja Commando, Art of Fighting 3
• April 13: The Beast Inside, Icewind Dale: Enhanced Edition, Crossed Swords, Ghost Pilots, Ninja Masters
• April 20: Beholder 2, Terraformers, Metal Slug 4
• April 27: Looking for Aliens, Grime, Magician Lord, Sengoku