Super Gem Drop for Mac offers all of the same great gameplay as the windows PC version. Arrange identical gems in groups of 3 or more to keep them from overflowing the screen. Match them in rows or columns of three to remove them and keep them from stacking up to the top. Drop enough gems and you're on to the next level. Running out of time? Hope for a Black Gem to get you back on track. It is very addictive and fun.