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Procedural mountain flight simulator in a single HTML file

by CyrilXBT (@cyrilXBT) · Sep 26, 2026

i asked opus 5.5 to build a flight simulator over procedural mountains in one html file 321 lines. one prompt. one bug fixed by hand. nothing in this world was modeled. every peak, lake and tree is generated from noise as you fly, so it never runs out bank left and dive toward the snow line. the mountains keep building in front of you follow @cyrilXBT
— CyrilXBT (@cyrilXBT) Sep 26, 2026

Prompt

The author shared the full prompt.

i asked opus 5.5 to build a flight simulator over procedural mountains in one html file

321 lines. one prompt. one bug fixed by hand.

nothing in this world was modeled. every peak, lake and tree is generated from noise as you fly, so it never runs out

Prompt by @cyrilXBT, from the post

Category: Games
Stack: Canvas
From the author: 321 lines; one bug fixed by hand.
On X: 88 likes · 13K views · 13 saves

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