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The quest “Free Heap” was a new kind of quest for @Bigrebo. Slide should be familiar to readers. #GDC18pic.twitter.com/FI25VGetQB

Early greybox for a part of Freeheap. After adding walls to make sure players didn’t stumble into unanticipated areas, @Bigrebo says team emphasized the traversal options between areas. #GDC18pic.twitter.com/luNwdNVDZE

Freeheap went from “pick your objective” to a more linear path. Here’s a visual model: #GDC18pic.twitter.com/lZeGiqYDEd

Here’s a look at the early breadcrumbing prototype meant to help guide players in Horizon’s open world. #GDC18pic.twitter.com/JnzStmRNgP

Conclusions from Free Heap (whoops, we goofed on spelling). #GDC18pic.twitter.com/Y18g9emBFT

For the quest Grave Hoard, here’s a look at the game’s grey box, compared to the final version that shipped. #GDC18pic.twitter.com/ClRgALullM

Grave Hoard is a “bunker quest.” More linear than the open world sections. Early feedback on that rough version was...negative.pic.twitter.com/kryIxCWTIV

Here’s a section of “the Killzone guide to good level design,” that helped @Bigrebo realize he needed to think about how players SAW the trouble room. #GDC18pic.twitter.com/P6yXLKEwNV