If you missed out on the Half-Life series back in the day, or just never picked up those games for your Steam library, then you are in luck. Set between the events of Half-Life and Half-Life 2, in the game Alyx and her father Eli "mount an early resistance to the Combine's brutal occupation of Earth".
The preceding Half-Life titles were immensely popular on release, and Valve often discounts them during its Steam sales, too.
For those that don't already own them, it's now possible to play every game in the Half-Life series entirely for free.
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This week, Valve decided to make the entirety of the Half-Life series of games available to play for free through Steam. However, because these games share some story elements and characters, Valve wants people to be able to play the previous games first.
The games that are now available for free download are: Half-Life, Half-Life 2, Half Life: Episode One and Half-Life Episode Two.
In case you missed the announcement last month, Valve is releasing the first new Half-Life game in over twelve years this March, though it doesn't have an exact release date yet. That said, you'll still have slightly over a month to go through them at the very least.
The Half-Life games might seem less remarkable to newcomers after decades of other studios following Valve's example, but even if you don't click with the first I would still recommend trying HL2.