Launching today

Yesterday’s Light

Launching today

Change the past in a tiny 3D garden puzzle

3 followers

Change the past in a tiny 3D garden puzzle

3 followers

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Change a garden in 1996 and watch the consequences unfold in 2026. Redirect water, grow a bridge from roots, and guide light home across six short puzzles. Built with GPT-6 Astra in Codex. Free to play in your browser, with no sign-up or runtime AI calls.

Free

Launch tags:Puzzle Games•Games•OpenAI Day

Launch Team / Built With

Framer AI AgentsDesign and publish professional sites with AI

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OpenAI

GPT-6 Astra Challenge

What became possible in your product with Astra that was not practical before?

Maker

Astra made a complete 3D time-travel puzzle practical to build and test as a short solo project. It helped connect deterministic puzzle rules with procedural gardens, growing roots, water and light, direct scene interactions, two languages, and responsive controls. It then worked through browser playtesting: finding why water was hidden, why camera gestures were blocked, and why controls stayed disabled after completion, and fixing those issues. We completed all six memories through the visible interface and checked 162 chapter/state combinations. The result is a playable world where moving a seed or redirecting water has a visible consequence thirty years later, while the released game needs no runtime model calls. Astra helped carry the whole project from an idea to a tested browser game.

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24h ago

Maker

📌

Hi Product Hunt, I’m Hengfei, the maker of Yesterday’s Light. What if a small change could travel thirty years? In this little 3D garden, you change the past and watch the future respond. Close a sluice to reveal a flooded path. Plant beside a broken bridge and let the roots grow across it. Turn a reflector so light can reach a forgotten window. Six short puzzles explore water, growth, light, storms, and drought. You can compare 1996 and 2026, scrub through time, and undo a choice whenever you want to try another idea. I built it with GPT-6 Astra in Codex for this challenge. Astra helped develop the game rules, 3D scenes, interactions, and fixes from browser playtesting. The build process used AI; the finished game runs entirely in your browser. There are no runtime model calls, sign-ups, or paid gates. I wanted something people could explore through small, visible actions. I’d love to hear which change surprised you, and where the connection between an action and its consequence could be clearer. Thanks for visiting the garden.

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7d ago

OpenAI

GPT-6 Astra Challenge

What became possible in your product with Astra that was not practical before?

Maker

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24h ago

Maker

📌

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7d ago