INVASION is a singleplayer modification of the famous game Half-Life. But a lot of innovations have been added. Among the most important new features, one can mention : - 44 maps : 5 levels of about 10 maps each. - 16 weapons, including 12 new ( infrared gun, flame thrower, sniper rifle ... ) - 2 new human enemies ( rocket launcher soldier and sniper ) and 2 new alien monsters. - a tank that you can drive and make its turret rotate independantly from the chassis. - a high definition bullet impact system, and particles blowing up from the walls on impact. - an entirely renewed protective suit, with a member-per-member damage management, and the possibility to stock batteries and medkits for subsequent use. - several gameplay innovations as digitpads use, or several kinds of ammo for the rocket launcher. - subtitles available in French, English, Spanish and German. Developed by the Invasion team.

Aublak says

8/10 - Agree (1) Disagree

Great mod that adds a lot of new features to the original gameplay. It has it own unique style and the maps look absolutely lovely. Invasion has many new enemies and weapons. Some are a hit and others are a miss. Very classic HL puzzle and action pacing. The thing that stands out about this mod is that the mod maker put so much effort in minor details that you may miss on your first playthrough.

There were some gameplay elements I didn't care for, like making health packs and batteries as inventoried items. But it didn't detract from the gameplay much. The enemies seem to have incredible aim, but they go down easier. The only thing I really hated was the lack of a flashlight, the lighter was absolutely useless. Invasion is a bit buggier then your average HL1 mod.