Techland's four-and-a-half year-old zombie kill 'em-up Dying Light is getting a surprise crossover with Valve's 10 year-old zombie kill 'em-up Left 4 Dead 2.

The announcement was made over at the Dying Light Twitter page alongside an image showing Left 4 Dead 2-style weapons raised and ready for action.

Survivors!

Are you ready for some serious zombie slaying? #left4dead2 style is coming! pic.twitter.com/Lv4XXyf8Jn — Dying Light (@DyingLightGame) October 23, 2019

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It's a surprise crossover, but a welcome one - and it's worth remembering both games remain popular on Steam, where they're in the top 100 games by current player count.

Left 4 Dead 2 is fast-approaching its 10 year anniversary, and during that time whispers of a Left 4 Dead 3 have popped up, but so far have failed to result in a sequel.

Could Valve have a surprise up its sleeve?