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Sega's 60th Celebrations to get a free Steam copy of NiGHTS Into Dreams.
In addition, Sega will be releasing four free limited-time minigames onto Steam over the next few days in download-and-keep form:
Endless Zone, a tribute to Fantasy Zone in the Endless Space universe.
Golden Axed, a single-level prototype of the cancelled "Sega Reborn: Golden Axe" circa 2013.
Streets of Kamurocho, a mash-up of Streets of Rage and the Yakuza franchise.
Armor of Heroes, a top-down multiplayer tank battle game using Company of Heroes assets.