Enter developer console
type "maxplayers 1"
type in the map you want
note: only 2 maps in the entire game are beatable with just one player, these being dy_accident2 (the map shown here) and dy_alien
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posting Half-Life screenshots daily untill HL3 comes out - day 50 - Lambda Sector Transport
posting Half-Life screenshots daily untill HL3 comes out - day 51 - Hydrofauna Studies Laboratory
posting Half-Life screenshots untill HL3 comes out - Day 54 (the last day) - Deliverance
Mr Crowbar Man
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Drew Gordon Freeman! :D
posting Half-Life screenshots daily untill HL3 comes out - day 49 - Lambda Office
posting Half-Life screenshots daily untill HL3 comes out - day 47 - Biodome Drainage System
posting Half-Life screenshots daily untill HL3 comes out - Day 53 - Steam in the pipes
posting Half-Life screenshots daily untill HL3 comes out - day 52 - Blue screen
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