SNK is bringing classics like King of Fighters and Metal Slug 2 to Twitch Prime for free
Twitch Primeにて『餓狼伝説SPECIAL』、『KOF 2002』などNEOGEOのゲーム7作品の無料配信が5月27日より開始! – ファミ通.com

The first of which will arrive on May 26. SNK promises “20+ free SNK titles throughout the summer,” with Art of Fighting 2, Blazing Star, Fatal Fury Special, King of Fighters 2000, King of Fighters 2002, Pulstar and Samurai Shodown II arriving first.
SNK is also teasing out other drops, which include some heavy hitters: Garou: Mark of the Wolves, The Last Blade 2, Metal Slug 2, The King of Fighters ’98 Ultimate Match Final Edition, Sengoku 3 and King of the Monsters. King of the Monsters?!