The faint light flows in from above and illuminates the reel made up of plant life. Therefore, happy dolphins are the key to free spins here, you need to put him on the second and fourth turntables to trigger this reward. In fact, the dolphins only appeared on the two reels, which somewhat affected his practicality.
The basic symbols of the Dolphin Reef scattering are usually boring 9,10, J, Q, K and A, but more valuable are hippocampus, starfish, turtles and orange tropical fish.