Dramoria - Cold, Metal
Year of the Dragon - Earth, Water, Air, Fire
Blast Furnace - Fire, Metal
Ulster Meadows - Earth, Plant
Rime or Reason - Air, Cold
Marsh Lands - Plant, Water, Earth
Cherry Road - Fire, Plant, Earth
Shimmering Faultline - Lightning, Earth
Electric Skies - Lightning, Air
Radiant Run - Light, Water
Shining Valley - Light, Plant
Brightless Vale - Dark, Earth
Darkened Dash - Dark, Fire
Here is a summary of the awards per each level and their range of rewarding. Of note is that once you reach level 35 (currently at the least) you will have the experience rewards removed from the spinner.
- The gold wheel features rewards including Gems (1-2), Experience, DragonCash, and Treats ranging from the thousands (Treats) to the hundreds of thousands (DragonCash). The highest XP reward I have gotten from the wheel so far is 36,000,000 but 2-4,000,000 is much more common.
- The silver wheel features rewards including Treats, Experience and DragonCash in the tens of thousands range.
- The bronze wheel features rewards including Treats, Experience and DragonCash in the thousands range.
Also note that you can get bonuses but that does not seem to have any sort of reason to it as of yet. (I have gotten food twice in a row and gotten an XP bonus but then done that again and not gotten anything but the food both times).
Best Answer
My observation has been that the bonus is generated randomly, but that the worse your prize is, the higher % chance that you will get a bonus. For a 1st place finish a 2500 or 2750 food prize are the ones that generate the bonus the most often for me.