Playing offline
Free, no sign-up, works offline.
There is no network traffic after the page loads. No images, no fonts, no analytics by default, and no server to ask anything of.
What to know
- The whole game is a page, a stylesheet and a handful of small scripts.
- Nothing is drawn from an image file — the runner, the cacti and the birds are all shapes drawn in code.
- The sounds are generated by the browser, not downloaded, so they work offline too.
- Scores are stored in this browser and survive closing the tab.
- Load the page once and leave the tab open; it will still be playable when the connection drops.
In more detail
This is why the whole game is drawn procedurally rather than from a sprite sheet. A sprite sheet has to be downloaded before the first frame, is authored at one fixed resolution, and goes soft on a high-density phone screen. Shapes drawn in code are crisp at any pixel density, cost nothing to fetch, and mean the entire game is smaller than a single photograph. The trade is that it looks like what it is — simple — which for a game of this kind is not much of a trade.
Questions
Does it install like an app?
It ships a web manifest, so most browsers will offer to add it to your home screen. It then opens full-screen and behaves like an app, though it is still just the page.
Will my scores survive?
They are kept in this browser's local storage, so they survive closing the tab and restarting the device. Clearing your browsing data removes them, as does the "clear scores" button.
Does it use any data while playing?
None. After the initial page load there are no requests at all — you can watch the network panel while you play and it stays empty.
Every figure on this page is read from the game's own tuning and recomputed on each build, so it describes the game you are actually playing rather than a version of it that once existed.