Is it possible that left 4 dead are offline?

Question

There are four modes of Left 4 Dead: campaign, versus, survival and single-player. The single-player mode is similar to campaign mode, but played offline with three artificial intelligence-controlled bots. A single player can be turned into an offline co-op game by other players on the same console.

Hagrid P Hazard · Accepted Answer

There are four modes of Left 4 Dead: campaign, versus, survival and single-player. The single-player mode is similar to campaign mode, but played offline with three artificial intelligence-controlled bots. A single player can be turned into an offline co-op game by other players on the same console.

Is it possible that left 4 dead are offline?

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