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What I mean with a set number of levels is something like Left 4 Dead, Payday or WWZ, where you have a fixed number of levels that you can play in any order you want, without necessarily having a proper campaign.

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over 3 years ago - /u/anaispalm - Direct link

You can play the missions in whatever order you'd like, except one that you'll have to unlock by playing. Check out our Steam page (https://store.steampowered.com/app/1024380/Second_Extinction/) for full info on what will be in the game at EA launch :)