Saving progress: where it lives and how to back it up
Slipline Garage saves your progress in the browser you are playing in, on the device you are playing on. There is no account and nothing is uploaded. That keeps the game private and instant, and it means clearing your browser data erases your progress unless you have exported a backup file.
What is saved
| Saved | Details |
|---|---|
| Garage credits | Lifetime total |
| Medals | Best medal for each of the 24 challenges |
| Lessons | Which of the eight you have passed |
| Personal bests | Per challenge or track, per scoring version, assisted and standard separately |
| Daily Runs | Your best result for each date you played |
| Garage | Selected car, paint and tuning per car |
| Settings | Audio, graphics, key bindings, assists |
The game writes at meaningful moments — the end of a run, a settings change, leaving the page — not continuously while you drive.
Four things that erase it
- Clearing browsing data (“cookies and site data”) for this site.
- Private or incognito windows. Storage is discarded when the window closes.
- Switching browser or device. Each has its own separate storage.
- Browser storage cleanup. Some browsers remove data for sites you have not visited in a long time.
Making a backup
Open Settings → Progress and data → Export backup file. A small file named like slipline-garage-backup-2026-11-10.json is downloaded. Keep it anywhere: your documents folder, a cloud drive, an email to yourself.
It contains scores, medals and settings. It does not contain ghost replays, and it contains nothing personal — no name, no email, no device details.
Restoring a backup
Choose Import backup file in the same place and pick the file.
- The game checks the file before changing anything: that it is a Slipline Garage backup, that it is not oversized, that it is not damaged, and that every value in it is within valid limits.
- It shows what the backup contains — credits, medals, lessons — next to what you have now.
- You choose Replace with backup or Cancel.
If the file is damaged, truncated, or from something else entirely, you get a plain message and nothing is changed. A backup made by a newer game version than the one you are running is refused with a prompt to refresh the page.
Import is also how you move to a new device: export on the old one, import on the new one.
Safety nets you do not have to think about
- A last-known-good copy. Each time the game saves, it keeps the previous good save alongside. If the main save ever becomes unreadable, that copy is restored and you are told.
- Updates migrate, never wipe. Saves carry a version number. When the format changes, older saves are converted on load.
- Two tabs do not overwrite each other. If you have the game open twice, saves are merged — the best medal and best score from either tab win.
- Credits cannot fall below what your achievements prove. Medals, lessons and daily completions each imply a minimum.
If the browser blocks storage
Some privacy settings block site storage altogether. The game still works: it runs in a session-only mode, tells you on the main menu, and progress lasts until the tab closes. Export still works in that mode, so you can save a file before you leave.
Erasing everything
Settings → Progress and data → Erase all progress asks for a second confirmation, then removes the save, its backup copy and all ghosts from this browser. Since nothing was ever stored on a server, that is a complete deletion. The privacy page has the details.
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