Brisbane's a puzzle. Step into it.

Plan for about 4 hours, plus time to eat. Progress saves, so you can stop for lunch.

A phone with a camera, mobile data and location turned on, charged full before you start. It runs in the browser on any recent iPhone or Android, so there is nothing to install. Bring water, a hat and sun protection: Brisbane's sun is strong, and the promenade, the bridges and the cliff top are open to it. There are water bubblers along South Bank and in the gardens.

About 6.8 km at your own pace on riverside paths, the South Bank promenade, footbridges and garden paths. It is mostly level until the end, when steps and a sloping path climb to the top of the Kangaroo Point cliffs to finish. Wear comfortable shoes.

At Kurilpa Bridge, at its South Bank end beside the Gallery of Modern Art. South Brisbane station and the Cultural Centre busway are a few minutes' walk away. VS players meet at Kurilpa Bridge, South Bank end before the countdown.

Getting back: the game finishes on the Kangaroo Point cliff top. The city centre is about 20 minutes' walk back over the river to the City Botanic Gardens, and South Bank is a little further.

Only to get to the start and home. The game itself is all on foot, with no ferry, bus or train in the middle, so the clock never has to pause.

Yes. The riddles work for first-timers, and they are written to surprise people who have lived here for years: most of the 25 are things you can walk straight past.

Yes, if they are happy with the distance and the climb at the end. The route uses public footpaths, the South Bank promenade, footbridges and garden paths, and Streets Beach, South Bank's free lagoon, is right beside it if anyone needs to cool down. Hold little hands near traffic and the river edge, and take breaks whenever you need them.

Julius Pizzeria in Fish Lane is a short step off the route near the start, South Bank has a working pub right on the way, and The Gardens Club café in the City Botanic Gardens is open in the daytime. Check their hours on the day: Julius closes on Mondays and public holidays. Progress saves, so stop whenever you like.

Every stop is in a public place you can reach on foot, and you photograph from where anyone can stand. Cross at the lights, keep left on the bridges and shared paths, where bikes come through, look up from your phone at the kerb, and take care on steps and beside the water.

Every find can be photographed from a public place, so you can play in a shower; a summer storm is a good reason to wait it out under cover. An unused code stays open for a year, so you can wait for a better day.

You never get stuck. Ask for the next clue whenever you like. If all five clues miss, the game shows you where the thing is, and walking within 25 m of it adds the piece. You just score a six for that stop.

The game lets you move on. A patchy location fix or a photo the checker cannot read never ends your day: carry on to the next stop, and that piece shows as unlocked with help on your card.

Yes. Share one phone on one code, or link several phones so a find on one unlocks for everyone. Linked codes can also play Competitive as one team, with one name on the leaderboard, and race each other in VS.

No. Every code can play Solo, Crew, Competitive or VS, and testers pay nothing at all. Linked codes can play both: Competitive as one team, and VS against anyone, crewmates included.

Each mode comes with its own, each once per walk. Easy has its arrow, circle and thermometer built in, plus a Free skip. Medium has its arrow, plus a Free skip and a Thermometer. Hard has nothing built in, plus a Thermometer, a Compass and a Free skip. The Thermometer runs cold, warm, hot inside the search area and the Compass points to it, both until you solve that stop; the Free skip shows the next clue at once, with no wait and no extra move. Every 5 stops a quick question asks what you saw, and every right answer wins another lifeline. Competitive has Hard's three, strictly, and a crew playing as a team shares one set. A VS match plays the lifelines of the mode you both agreed on.

Yes, as long as they have their own Jigwalk code. There is no matchmaking: send the 6-character match code however you like, they choose Competitive and Join VS, and see the match's mode: Competitive unless you picked Easy, Medium or Hard when you made it. Pressing Ready means you both agree to it. A match that never starts closes after 12 hours.

Finished Competitive walks in Brisbane, VS matches on Competitive rules included, on two boards. A VS match on Easy, Medium or Hard is a friendly race, so it does not go on the leaderboard. Best score ranks the fewest moves first, with the faster time breaking a tie. Fastest ranks the quickest finish first, with fewer moves breaking a tie. Each line shows a nickname or a team name, then moves, time and lifelines used.

Not to play: your game code is all you type in. Free tester codes are claimed with an account, one claim per account for each city. The leaderboard only ever shows the nickname you choose at the finish.

English.

Until 7 days after you finish. If you have not finished, it stays open for a year from when you get it.

Nothing, for now. Brisbane is free while we test it. Prices, the boxed puzzle and the finish treat come with the official launch.