Game's features are:

WILD: Wild symbol substitutes for any symbol except for: BONUS

RE-SPIN: Feature starts when at least one stack of 3 WILD symbols appears on the any reel. An extra free spin (RE-SPIN) is played with the wild reel. Re-spin is played with the same bet it has been activated.

FREE SPINS SYMBOL: 3, 4 or 5 FREE SPINS symbols start 10, 12 and 15 FREE SPINS respectively.

FREE SPINS: The FREE SPINS are played with the same bet that activated the FREE SPINS. On every spin 1 door hinge appears over the reels. Every door hinge stays on the screen until the end of FREE SPINS.
When WILD symbols appear next to the door hinge it will be expanded to the adjacent position.