“Retaliation picks up where Dark Operations left off. There will be no Xen or displacer in Retaliation. Action is the main theme. It will mainly be an encounter against military targets, but there is a healthy dose of aliens too. There will also be many sequences and a few puzzles to keep things interesting. Retaliation is the last of this series. Enjoy.” Barry A Bollinger
There are not so much good Opposing Force mods, and there is the one that I liked. The gameplay is very balanced, there is a good plenty and variety of monsters, weapons and allies. Some pretty scripts and simple puzzles are adding a bit more enjoy. Maybe not too much of story, but other things, in comparison with other OF mods are quite good. Also it's one of (not too many) long enough OF mods!