There are two versions of Wheel Of Fortune available, both based on the gameshow of the same name.
The free play version above is the version dubbed "Triple Action Frenzy"
and available to play at Wagerworks casinos (no US players however). It's called "Triple Action" because
of the way the feature works. There is also a "Wild" symbol which can muliply wins by up to 5x, and the feature
itself is a pick 'em bonus round triggered by 3 adjacent "Triple Action Bonus" symbols which leads to the spinning the Wheel
Of Fortune.
For USA players (who can't play this game for real online) it is worth noting that Microgaming have
developed a similar'ish game called "Wheel Of Wealth", which you can play for free or for real. Go to
the Wheel Of Wealth page and have a spin.
The second version of the Wheel Of Fortune slot is a simplified version of the
Triple Action slot above.