Depending on what you are looking for, here is how to find and download this game, as well as a few other niche results that use the same name. 1.
If the puzzle game isn't what you meant, you might be looking for one of these: dream-15-game-download
Refers to a historic mixed martial arts event (DREAM.15) from 2010. You may find fight footage on YouTube, but it is not a game. Quick Gameplay Guide (Puzzle) Depending on what you are looking for, here
You can find it on Google Play as Dream 15 by developer Joyquest. dream-15-game-download
Were you looking for the specifically, or a different "Dream 15" related to fantasy sports or poker ? Dream 15 - Apps on Google Play