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Tonic is a single player modification for the first person shooter Half-Life created by Valve Software. Originally named "Kill Or Be Killed", the mod has since gone under a very large reorganization after a couple of months of inactivity. What started out as a little mess around project by a 12 year old kid eventually evolved into what you see here over a period of about 4 years. Early in development all work on the mod was lost due to a hard drive failure, and everything had to be restarted. Since then the mod has picked up different members, lost other members, nearly failed, and flourished with development. Complete information here.

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