Secret tours will be held across the Sydney CBD this weekend with $10,000 worth of vouchers up for grabs for the first 2,000 people to solve the riddles and unlock the clues.
First 2,000 to solve these riddles get a $5 voucher towards a restaurant. There're 5 different routes, and 43 fun riddles to crack together.
Note that secret city trails normally costs money to participate (from when I clicked on other cities around the world), so there's the added benefit in addition to the $5.
Hopefully a fun family activity! Enjoy!
Update (11 May 21) from @BryRoo:
There's still 1,500 vouchers up for grabs.
Additionally, all trails in Sydney have become free for the next 6 months!