Sigma

Sigma is a lively game inspired by the light spectrum. You are a photon that has to follow its color beam and collect as many photons of the same color on your way.  Discover how white light is dispersed in all the colors of the rainbow and follow the right path without touching the edges. Each time you hit them the game resets on one of the 3 color beams. Use your hand-eye coordination to score high at this unity game.

Play Sigma right in your Mac OS X Dashboard.
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http://retro.gmer.onemac.net