In Dying Light 2, players are likely to experience just 50% of the game in their first playthrough, according to developer Techland.

Dying Light originally came out in 2015 to critical acclaim and massive sales, so a sequel was definitely in order. That sequel was announced at E3 2018 with a tentative release date of early 2020, and this year we’ve got an update on how things are going.

Techland had a playable demo set up at this year’s E3 that showcases a bunch of new mechanics, including increased parkour options, a grappling hook, and even a paraglider. You can even use zombies to break your fall after jumping through a window.

But the biggest change will be the new choice-based storyline, which Techland says will make it impossible to experience the whole game on a single playthrough. In fact, they estimate that just 50% of the game will be seen by the player on any given run, requiring multiple passes to get every possible story.

Dying Light 2’s E3 demo has just 30 minutes of gameplay that takes you through the game’s first major choice. As new protagonist Aiden Caldwell, you’re trying to survive in a post-zombie apocalypse, scrounging weapons and resources from wherever you can find it.

RELATED: E3 2019 Preview: Dying Light 2 Chases Gaming's White Whale - A Story Where Choices Actually Matter

The biggest problem in the world is lack of water, so the first quest is to help an NPC turn on the water supply. That NPC eventually gets shot, and you must decide whether or not to save the NPC with some first aid or go after the attackers to exact revenge (and maybe turn on the water while you’re at it).

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Aiden is presented as a mostly blank slate, so each choice will actually build the character as you play through the campaign.

It’s unknown how many times you’d have to play through Dying Light 2 to see every possible storyline, but we do know that each decision made, each side quest taken, and even moment-to-moment combat choices can affect where the story goes.

Oh, and there’s also an autosave, so no matter what you do, you’ll have to live with those decisions.

Dying Light 2 releases in the first half of 2020 for Windows PC, PlayStation 4, and Xbox One.

NEXT: Shroud On Xbox E3: Dying Light 2 Is Trash, But Lego Forza Is Genius

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