The tunnel crawl

Lore & Background

Inside presents its world without exposition. The boy wakes in a field, and the environment tells the story: overgrown ruins, a militarized bunker complex, a sterile white facility. The tunnel sections sit beneath or within these structures—concrete-lined shafts, drainage channels, and maintenance crawlspace that feel like the circulatory system of a dying institution. The lighting shifts from cold fluorescent to near-total darkness, and the only sound is the boy's breathing and the wet scrape of his hands on damp concrete.

The design language of these passages is deliberately oppressive. Playdead removes the player's ability to jump, to sprint, to look back. The camera locks to a tight side-scrolling frame, and the boy's sprite shrinks to fit the gap. There is no minimap, no objective marker. The player simply pushes forward, hand over hand, until the passage opens into a wider chamber and the breathing eases.

Thematically, the crawls echo the game's broader concern with bodies that are too large for the spaces they're forced into—children in adult institutions, individuals in a system that treats them as units to be processed. The tunnel is the system's throat, and the boy is being swallowed.

In Their Own Story

The fluorescent tube overhead buzzes and dies. In the sudden dark, the boy's fingers find the lip of the concrete channel ahead. He drops in. The ceiling is close enough to brush his hair. Each step sends a faint drip of water into the black below. He can't turn around—the gap behind him is already too narrow. Ahead, the passage narrows again, then narrows again, and his shoulders press the rough walls on both sides. Somewhere far above, a door slams. He keeps crawling. The air tastes like rust and old electricity. After what feels like minutes, the passage levels out, and a pale blue glow seeps in from a grate at the far end. He does not stop. He never stops.

Reader's Guide

In Inside, the crawl mechanic activates when the boy crouches (typically the down arrow or S key) and moves through a passage too low for his standing hitbox. You will see a narrow gap, a drainage pipe, or a maintenance slot; drop into crouch and the sprite shrinks to fit.

What makes a crawl sequence click: the path is always a single, committed line. There is no jumping out, no alternative route. You are pushing one axis at a time. The tension comes from the camera staying locked and the absence of any HUD cue telling you how far you have to go.

Escalation across the game: early crawls are short—under a fence, through a low doorway—and serve as teaching moments. Mid-game, the bunker and facility sections extend them into multi-screen stretches with mid-passage obstacles (a loose grate you must push, a puddle that slows your speed, a section where you must time your movement to a closing shutter). Late-game crawls pair the low passage with a threat above—guards, turrets, or the white-suited figures—so you are simultaneously navigating a tight space and managing a vertical danger you cannot see.

The key rule to remember: once you enter a crawl, your vertical position is fixed. You cannot jump, and the only exit is the far end. Plan your entry, then commit.

Did You Know?

• Inside contains no spoken dialogue, no text boxes, and no tutorial prompts; the crawl mechanic is learned purely by seeing the boy's silhouette shrink to fit a gap.
• Playdead, the studio behind Inside, previously made Limbo (2010), which uses a nearly identical crouch-and-crawl mechanic in its underground sequences—Inside expands the idea into longer, more varied passages.
• The game's camera never zooms out during a crawl, keeping the boy at the same pixel scale as open areas, which makes the confined space feel subjectively smaller than it is on screen.
• Inside was released on PlayStation 4 and PC in 2016 and later ported to Xbox One and Nintendo Switch; the core crawling controls remained consistent across all platforms.