Download of ChangeReaction 3.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This software for Mac OS X is an intellectual property of Draconis Entertainment. ChangeReaction for Mac lies within Games, more precisely Puzzle. We recommend checking the downloaded files with any free antivirus.
From the developer:
ChangeReaction is a classic audio puzzle game for Mac. ChangeReaction is played via the keyboard and your ears. Navigate the game board with the arrow keys, dropping coins on the stacks to create chains of explosions and rack up higher and higher scores.
You may want to check out more Mac applications, such as The Race, Flip Words 2 or Unsolved Mystery Club - Amelia Earhart, which might be related to ChangeReaction.