Click on "Play" to start a game.

Click on Level to start at the desired level (only previously completed levels will be accessible)

Click on "Options" to adjust the sound settings.
Level selection screen.

All levels shown with a green light are available for play.
Levels tagged with a red lights will need to be solved before they can be replayed.
Click on Sound or music to activate or deactivate the desired audio channel. (music or sound effects)

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http://www.phelios.com