Re-enter the Half Life Universe and revisit City 17 in the time before Freeman, in this fan made single-player mod. The Resistance is threatened by a decisive Combine assault, and as a wanted Resistance member you will need to fight to escape from the Combine's clutch. At the same time, a mysterious force is working towards ends unknown...
I hardly give 10/10, but if you're making a HL2 singleplayer episode, this is how it should be done. It made great use of all assets of Half-Life and combined them seamlessly and certainly long enough for a mod.
If there are plans for a sequel, I'd like to see more various puzzles and action. Many things were direct copies out of the Half-Life series which, as a seasoned player, I saw coming from a mile away. However, the battles were more challenging than Valve dared, which was a big plus for me.