From Saturday May 29, families can use their phones to take part in an adventure in the middle of Peterborough - can all 10 Secret Carnival characters be tracked down?
The trail has been put together by Peterborough Libraries and QR code trail experts High Street Safari, with participating venues displaying the codes in windows.
Parents will not need to download or sign up to anything, and the trail can be completed entirely outdoors, with no need to go inside any of the venues.
It takes around 45 minutes to complete, but has been designed in a way that it's possible to spread it out over multiple visits to the city centre.
Scanning each character's unique QR code will reveal their names and what their role is in the carnival. At the end of the trail, a personalised digital 'selfie storybook' can be won - so families need to be taking funny selfies as their adventure unfolds. The book will tell readers about the day their family went on a tour of the secret carnival, so they become stars of the story.
Julie Bennett, chief operations for people and change management at City Culture Peterborough, said: "We are keenly aware that families will want to look for fun activities that are safe, socially distanced and contactless during the school half-term and this trail is the perfect activity for them to take part in.
"We’re grateful for the venues that have agreed to be part of the trail.
"Parents and carers are often stuck for things to do with children during holidays and this is a great way to get outdoors and explore all that our city centre has to offer.
"The trail is lots of fun and the digital storybook is an excellent reminder of how they became part of the Secret Carnival by successfully completing it."
Martin Blackwell, national coordinator for the project, said: "We’ve run several trails like these and have been blown away at the response considering the difficult climate on the high street.
"We had over 30,000 families play last year in over 200 locations. If something fun like this can help make families and kids feel good about going back out onto the high street in a safe way, then we’ve done our jobs."
To find out more about the trail, visit www.secretcarnivaltrail.com.