: Are there any future plans for adding co-op support for Marathon 1?
We have ideas, but nothing concrete yet. As explained last year, exploration missions worked differently in Marathon 1, in a way that's not co-op friendly. M1A1 simply modified the maps to fit Marathon 2's exploration type, but our goal is to run original Marathon maps (including third-party maps), so tweaking them isn't an option.
For Marathon 1 co-op, the best solution is to use the Marathon data from Aleph One 1.0, as that's the most faithful version of M1A1.