Which 'Half-Life' games to play before 'Half-Life: Alyx

With "Half-Life: Alyx" set for 2020, four previous titles remain essential: "Half-Life", "Half-Life 2" and "Half Life: Episode One and Two".

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Half-Life and Half-Life 2 are free to play on Steam - Polygon

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Every 'Half-Life' game will be free to play for the next two months on Steam

Is this the right order to play Half Life in? Are there any more games other than these? : r/HalfLife