Half-Life 2: Episode 3 is an action-adventure game released on PC in December 2020. The game represents a continuation of the Half-Life 2 saga, picking up where previous installments left off.
Recently, a significant data leak from Valve surfaced online, reportedly containing files spanning from 2003 to 2013. Among the disclosed materials were assets potentially connected to Episode 3, including what appears to be a weapon design from the game. The leak also featured content from other Valve titles, including Portal 2 beta materials. The discovery has drawn attention from the community as a rare glimpse into Valve's development archives during that period.
via PC Gamer
The leak purportedly includes files that date between 2003 and 2013.