Royal, 72, and her husband, Prince Charles, 73, were spotted browsing along the High Street in Clapham Old Town, southwest London, before stopping outside up-market pet store.
The team at UK-based SGS Engineering has produced four garden brainteasers, challenging the nation to spot the hidden tools in the outdoor scenes. But can you beat the 31-second average?
Can YOU find the hidden lily? Flower-themed brainteaser will put observational skills to the test dailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailymail.co.uk Daily Mail and Mail on Sunday newspapers.
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If you re struggling to spot the computer mouse try looking towards the top right of the cluttered image.
Still haven t managed to find the mouse? Scroll down to find the answers circled in red.
Still haven t managed to find the mouse? It s located in the right hand corner of the brainteaser
Another tricky seek-and-find puzzle is asking eagle-eyed readers to spot the dog who stole the sausage at the BBQ.
The brainteaser, by watch retailer Toff London, challenges you to find the dog who has thieved the snack, hidden in a graphic that features strings of sausages scattered among the canines to make it all the more difficult.