.18 by far! Everything after has been rather disappointing. EDIT: 1st: .18 2nd: .17 3d: .16 4th: .15 5th: .14 The closest was between .17 and .18, but .18 was simply a game changer, with all the awesome new parts, revamped textures, new mechanics, much improved GUIs and music, docking, flight planning, action groups, support for Unity 4, a proper demo...goes on and on... Squad was doing great until .18, every update was better than the next, until .19 and then .20 hit...