Cinder Coil

A snake that burns its own trail into permanent walls, so growing longer is also how you corner yourself.

Date: 2026-10-28 Genre: snake variant Status: Playable build

Concept

Cinder Coil is a snake game where the ground you cross doesn't forget you. Drag a glowing coil across a dark grid, and every cell you leave behind smolders for a few seconds before sealing into a permanent wall. The arena never resets or scrolls; it just keeps losing cells to your own trail, so the back half of a run is you against a cage you built yourself.

How to play

Eat embers to grow and score. Steer with the arrow keys or WASD, or tap the on-screen arrows (mouse clicks work on the same buttons). You die by hitting the grid edge, your own body, or a wall your trail already sealed. Press R, tap Restart, or hit any direction key to go again.

Core mechanics

• The trail seals shut. A cell you vacate glows for a few seconds, then locks into a wall for the rest of the run. Cross it again and you're dead.
• Normal embers (orange) grow the coil by one segment and add 10 points. Eating them also ticks up both the move speed and how fast the trail catches fire.
• Cold embers (blue), which start appearing after your eighth ember, pay 40 points but cost you three tail segments on the spot. That's a net two segments shorter, and the freed cells ignite instantly instead of waiting out the usual delay.
• Two ramps, staggered. Move speed steps up every four embers; the trail's burn delay only starts counting down after your fifth ember, then tightens every five after that. You learn "faster" before you have to learn "the floor behind me is closing."

Progression & scoring

The first five embers are a grace period, no fire yet, just you learning to steer. After that, every tick up shaves time off how long a cell stays crossable before it locks, while the move interval drops from 150ms toward an 80ms floor. A long run isn't just surviving; it's threading a smaller patch of open grid while moving faster through it. Cold embers are the standing risk/reward call: skip them and keep your length, or grab the 40 points and accept a shorter, more fragile coil.

Look & feel

Everything's rendered on canvas in an ember palette: a near-black field, a head that's almost white-hot fading down the body toward dull red at the tail, and walls that flicker between two fire tones so they read as "alive" rather than static. The cell about to seal warms from dim brown toward bright red as its timer runs down, so the countdown is something you can see, not something you have to memorize. Sound is a handful of WebAudio tones: a bright triangle blip for a normal ember, a lower sawtooth growl for cold ones, a descending square-wave drop on death.

What makes it fun

• The fire-trail twist turns the classic "don't hit your own tail" rule into something worse: you don't just have to avoid your body, you have to remember your own history, because the map keeps shrinking around every loop you've already drawn.
• Cold embers create a real in-the-moment decision instead of a scripted event. Take the points and get fragile, or stay fat and safe and slower to score.
• Two separate ramps (speed, burn delay) arrive on different beats, so the game teaches "move faster" before it demands "plan your route around a closing wall." Each new pressure gets its own moment to land.