Hop & Go
An endless runner: jump over obstacles that come faster and faster, and beat your high score.
V2 · 0:11 demoPlay
Full screenV2 · 16 KB · one HTML file
Prompt
A one-button endless runner1 What it does where a character jumps over obstacles that come faster over time4 What must happen, with a high score4 What must happen.Exactly as it was typed.
- What it doesWhat it is, and how you control it.
- Who it’s forThis prompt leaves “who it’s for” to the AI.
- How it should feelThis prompt leaves “how it should feel” to the AI.
- What must happenThe action, and how it gets harder. What is kept.
What this teaches
Keep the controls to one button and say how it gets harder, and the game builds the curve.
- "one-button" keeps the whole game to a single action.
- "obstacles that come faster over time" is the difficulty curve in five words.
- "with a high score" gives a reason to play again.
Changes
Add ducking under flying obstacles and switch to night colours every 500 points.Change request · V1 → V2
What changed
- Flying obstacles come in, and you duck under them by holding the Down arrow or the Hold to duck button.
- The colours switch to night every 500 points, and back to day at the next 500.
What stayed: Jumping, the speed-up and the high score work as before.
Try a change
Each one starts your own draft in the Studio. Nothing is built until you press Build.
How it was made
- V1 Built on Oct 15, 2026 · Direct · Verified on the second try · 97 s · Tested on desktop and phone · 1 AI Credit
- V2 Changed on Oct 15, 2026 · Verified on the first try · 59 s · Tested on desktop and phone · one change, no AI Credits
Known limitations
- The high score is kept in this browser only.
- The scene is drawn on a canvas; a screen reader hears the score and messages, not the obstacles.
- Holding Duck while in the air does nothing; press it again after landing.