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I’m not sure if “immersion game” is a tagline that THW has coined for their games, as I have not come across it before but, essentially, it describes a type of game that sits between a tabletop skirmish game and an RPG. By using reaction rolls, the characters in the game are meant to act and react to events as they unfold in a way that is more natural and logical than the traditional “I go, You go” of tabletop wargames.
What I really like is that there is an extensive campaign side to the game, and that the game can be played solo as well.
I first came across the game either on TMP or on one of the many blogs I follow. I joined the Two Hour Games Yahoo Group and read a couple of very entertaining After Action Reports written by guys fumbling their way through character creation and initial encounters.
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I elected to get the printed version of the rules from Two Hour Wargames, rather than the pdf, and it came, spiral bound, on a nice weight of paper with a colour card cover. The spiral binding made sense after my initial surprise as the book is going to spend a fair amount of time open when in play. I intend to rebind it, adding clear plastic covers to protect the very nice cover art, as I have access to a spiral binding machine.
I will post some updates on this soon, I think.