The best replacement for single player is l4d2.

The best alternatives to single player are rated as following:
★★★★★  l4d2
★★★★  mmo
★★★  left 4 dead
★★★  mmorpg
★★  multiplayer
★★  left 4 dead 2
★★  l4d
★★  multiplayer diablo 3
★  left dead
★  mode l4d
  singleplayer
  multiplayer minecraft

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Google Trends

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single player
l4d2
mmo