Hidden Cambridge was very pleased with the comments from Varsity on one of their more unusual activities (link attached below). This activity combines the benefits of doing a self-guided treasure hunt i.e. you can openly chat with your friends/family while searching for unusual spots and clues while at the same time interacting live with a guide. Using WhatsApp, you will get your "instructions" and be guided at each step along the way. And, as the article suggests, it's just as suitable for locals as for visitors to Cambridge.
Read the review here https://www.varsity.co.uk/arts/25131