The latest in a "long line of initiatives to bring vibrancy to the Hastings city centre" was launched on Saturday.
More than 200 children came to Albert Square Park to try out the Imagination Playground.
Portable, flexible and light enough for even small arms to lift, the set of large foam blocks, tubes and connectors were a big hit as the kids built everything from forts and slides to cars and flowers.
Hastings City Business Association general manager Susan McDade said she could not stop grinning at the creativity and teamwork displayed by the kids.
"The Imagination Playground is a fantastic addition to the city centre and enhances the Hastings experience for families. I also saw quite a few dads having just as much fun building as well."