TOP-DOWN ADVENTURE × 60-SECOND DAYS

Sundown Keeper

Every day on the island lasts one minute. Explore, change the world a little each run, and relight the lighthouse.

⏱ ABOUT HALF AN HOUR, A MINUTE AT A TIME · RUNS IN YOUR BROWSER · SAVES AUTOMATICALLY

ADDED: 12 OCTOBER 2026
LAST UPDATED: 12 OCTOBER 2026
MODEL: CLAUDE OPUS 5.5
REF: 4ea9b66d

We asked for two hours. The machine delivered about thirty minutes, then wrote a test that plays the entire game in nine days. It respects your time more than we do.

THE ENTIRE GAME DESIGN DOCUMENT

THE PROMPT THAT STARTED IT ALL 🧠

> Create a game in the style of Minit: every run lasts exactly 60 seconds and always starts in the same spot. The goal is right next to the start, visible but locked. The world is open to explore and persists between runs. Each run should leave the world changed: an item found, a gate opened from the far side, a bridge lowered, a character helped. Those changes let you travel further or do something new on the next run. Shortcuts, teleports and abilities keep the frontier a few seconds from the start, so most of each minute is spent pushing into new ground. Progress comes from exploration, items and characters, not from self-contained logic puzzles. Aim for about two hours to finish. You have full creative control over everything else.▌

That’s it. That’s the brief. Everything else — every line of code, every pixel, every note — came out of the machine. Typos preserved for authenticity.Disclosure: a human may have intervened afterwards, when the machine made the first upgrade cost more than the GDP of Wales, or decided a run should last eleven hours. Even then, the human only fixed it by typing more prompts and sighing loudly. 🫠

About the Slop

Sundown Keeper is a top-down adventure on a small island where each day lasts one minute. The lighthouse lamp went dark in a storm, and since then the sun sets a minute after it rises. Every day starts on the lighthouse doorstep, at a locked door with four empty sockets for the four lenses of the lamp.

Your tools stay with you, opened chests stay open, and the people you help remember you. But you can only carry one thing at a time, and whatever is still in your hands at sundown goes back where you found it. So each lens has to reach the lighthouse door on the day you find it.

The minute is a whole day: the tide is out from 10 to 30 seconds, glowcaps only shine after 45, and the smith, the mole and the witch work overnight. Ottie’s ferry, Dot’s mine cart, a mole’s tunnel and a signal cannon keep the frontier within reach. No actual sundowns were harmed. There have been a lot of them.

🎮 CONTROLS

Arrows or WASD to walk
Space, Z, E or Enter to act
Hold the action key to keep working
Esc or P to pause, see the map or give up the day
M for sound, gamepads work too

✨ GAME-CHANGING FEATURES

Sixty-second days that always start on the lighthouse doorstep
A persistent island: opened chests, helped people and shortcuts stay
Carry one thing at a time, and lose it at sundown
Tides, night-time glowcaps and characters who work overnight
A ferry, a mine cart, a mole’s tunnel and a signal cannon
24 places outside, 10 inside, and four lenses to find

How To Play

A quick guide for your first session. The machine wrote the game; we wrote this bit from its README.

Each day starts at the locked lighthouse door. You have one minute before sundown.
Walk with the arrows or WASD, and press Space to talk, take, open or use whatever you face.
Hold the action key to hack brambles, dig, smash rock and shake trees, and time your press to land a fish or pick a lock.
You carry one thing at a time. Anything still in your hands at sundown goes back where you found it.
Help people and open shortcuts so the edge of the map gets closer to the start each day.
Bring each of the four lenses to the lighthouse door on the day you find it, and relight the lamp.