Downfall (for Mac OS X) 2.9.4 Publisher's Description

3D arcade puzzle game (similar to Bloxter and other falling-blocks games).

It features real-time 3D graphics and lots of different boards to play.
All boards have special blocks like indestructibles, dynamite sticks, snow shovels, wrecking balls etc.

Another cool feature is the import-export highscores, which lets you swap highscores with your friends.
When importing, Downfall merges the highscores together, keeping the best ones.

The game is easy to learn. You just drop stacks with colored blocks to form lines that will react and disappear, to score points.
Keep in mind that each board requires its own tactics and skills to master!