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Clues point to Half-Life: Alyx being more than than just a prequel

Alyx Vance, Half-Life 2 Cut Npc's Wiki

Until Alyx spoke, everyone assumed they were Gordon Freeman, say Valve

Steam Workshop::Alyx - Half-Life 2, BETA

Half-Life vs Half-Life 2 vs Half-Life Alyx Graphics Comparison

Half-Life 2 Mod Swaps Alyx for Star Fox Adventures' Krystal and Her Original Voice Actress

Half Life: Alyx - Beta Content

Alyx Vance: The Best Thing About Half-Life 2 > The Cinema Warehouse

Metropolice comparasion - Half Life Alyx vs Half Life 2

Half-Life: Alyx: Every Voice Actor Confirmed and Rumored - IGN