There are 4 releases tagged with “100SDoN”

100 Summer Days of Nostalgia. A special event in 2011 where 100 older Half-Life maps and mods were played or replayed. For more details. see the event’s dedicated page.

Follow these releases via RSS

Hard

for Half-Life

Single Player First Person Shooter Maps and Mods for Half-Life 1, 2 and Episodes 1, 2 and 3

You play as FBI agent Jeremy Hard, who has been sent in to Black Mesa to do something (sorry, but I didn’t pay much attention to the text on the screen).

You have Freeman’s identity card, so everybody thinks you are him.

Go do what you do best – shoot enemies and press buttons!

1
5
4
4
1

Total Downloads: 2,94725th July 2011
37 Comments and 15 recommendations with no significant bias

The Xeno Project 2

for Half-Life

Single Player First Person Shooter Maps and Mods for Half-Life 1, 2 and Episodes 1, 2 and 3

The story picks up where The Xeno Project left off.

After fighting your way across Xen and escaping in a rocket, you are captured and imprisoned aboard an Earth vessel full of grunts, lead by the our old friend the Gman.

What happens next? I’m afraid that’s up to you. Good luck….you’ll need it.

2
4
8
10
1

Total Downloads: 3,39915th July 2011
37 Comments and 25 recommendations with no significant bias

The Xeno Project

for Half-Life

The terraformation of Xen has begun. The planet now supports a breathable oxygen-nitrogen atmosphere and earth-like gravity. A scientific facility called the Xeno Project has been set up on the planet for continuing research into portal technology. Tension on the planet is running high due to the secrecy surrounding the project and the military’s distrust of the scientific community.

You are Gordon Freeman. Your mission is to report to the underground test lab at the Xeno Project.

1
1
5
14
3

Total Downloads: 5,61214th July 2011
43 Comments and 24 recommendations, most say "Play It Now!"

Assault on Roswell

for Half-Life

Single Player First Person Shooter Maps and Mods for Half-Life 1, 2 and Episodes 1, 2 and 3

See what the U.S government keeps secret! Go undercover to infiltrate the top-secret military base at Groom Lake Nevada.
Alarming reports within the media have led the British government to send you on a trip to the back of beyond, a place called Roswell, widespread insanity of the American populace has brought the country to its knees, your mission if you choose to accept it is to infiltrate the Roswell base and stop a possible contamination of a deadly virus (maybe alien!) and eliminate any suspected parties

9
2
2
1

Total Downloads: 2,13213th July 2011
38 Comments and 14 recommendations, most haven't enjoyed it