KKnD, or Krush, Kill 'n' Destroy is a series of post-apocalyptic real-time strategy games by Beam Software. KKnD was released in 1997, while a sequel - KKND2: Krossfire was released in 1998. Towards the end of 1997, KKnD Xtreme, an expanded version of the original was released, which featured extra missions and enhancements.
All games in the series feature a campaign for each of the different factions in each game, alongside multiplayer capabilities.
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This is a link to the GOG link for the game: http://www.gog.com/game/krush_kill_n_destroy_xtreme