Tutorial
Four guides. The first one is the walk itself — if you're holding a card or a postcard and wondering what to do with it, start there.
When something goes wrong
GPS insisting you're not where you're standing, a stop you can't reach, a planet credited by mistake, or a walk you want to wipe and start again.
Read it →Build your own walk
The five steps of the planner: pick a Sun, size it, aim the route, place your stops, then keep it private, send it to a friend, or submit it to go live.
Read it →Add a planet to a photo
The photo editor. Shoot on a real camera, then drop the picture in afterwards and place the planet at true scale — right in your browser, nothing uploaded.
Read it →What each one does
The wallet card and the postcard back carry a small row of QR codes. You can walk an entire mission using nothing but GO — the rest are shortcuts and escape hatches.
- GO Both pieces The only code you really need. It works out where you are in the walk and shows you the right screen — starting at the Sun, pointing at your next stop, or bringing up the planet you're standing at.
- AR Both pieces Straight into the camera, skipping the rest. Useful when you're already at a stop and just want the shot.
- Explore Wallet card The map of every published walk, focused on wherever you are.
- Tutorial Postcard back This page.
- Lost? Both pieces The help line. Next stop, “I'm here”, skip a stop, switch walks, start over — see the getting-unstuck guide.
The postcard front carries one more: the mission code, which opens that specific walk's page. It's the only code tied to a single city — everything else works anywhere, forever.
Turning permissions back on
The walk still works without either. Location just picks your next stop for you instead of you tapping it, and the camera is only needed to see a planet appear in front of you. If you said no and want to change your mind:
iPhone · Safari
Tap aA at the left of the address bar → Website Settings → set Camera and Location to Ask or Allow, then reload the page.
If they aren't listed, it's blocked system-wide: Settings → Safari → Camera / Location.
Android · Chrome
Tap the lock or tune icon to the left of the address bar → Permissions → turn Camera and Location back on, then reload.
Desktop
Click the lock or info icon in the address bar → Site settings. Worth knowing: live AR needs a phone. Desktop browsers can't run it, which is a limit of the AR engine rather than something we chose. The photo editor works fine on a desktop.
Things people ask
Do I need an account, or an app?
Neither. It runs in your phone's browser, and your progress is saved on the device itself — nothing is sent to a server, nothing to sign up for. The trade-off is that progress lives in one browser on one phone; there's more on that in getting unstuck.
Does one card really work everywhere?
Yes. The card carries no city and no mission — the walk is worked out from where you're standing. The goal is for it to be a travel companion: if you're in a new city and don't know what to do, you've likely got a fun nerdy walk in your wallet.
Do I need the card to walk a mission?
No — the route, the stops and the directions all work from the site. The card is what makes the planet appear at true scale in front of you, because the AR uses its printed border as a real-world ruler. Without it you get the walk; with it you get the walk and the planets.
GPS says I'm not at the stop, but I am.
City GPS is routinely tens of metres off. Every screen that mentions a stop has an I'm here button, and tapping it credits the stop and brings up the planet. We'd rather trust you than the satellites.
Why is Neptune so far away?
Because that's genuinely how far Neptune is, at the scale of the Sun you're standing next to. We never shrink the gaps to make a route tidier. Feeling that distance in your legs is the entire idea — and taking the bus to Neptune isn't cheating.
There's no mission in my city.
Build one. Pick a landmark for the Sun and the planner works out where every planet lands at that scale. Keep it to your own phone, share it with friends, or submit it to go live for everyone — here's how.