This mod poses a simple query. A mountain should be difficult to pass, but shouldn't it be possible? This one says yes. With it, your units will be able to cross over mountain tiles. It will be difficult, costing 5 move points per tile, but you'll be able to get through if you're persistent to seize your goals on the other side. What's more, mountain tiles will still supply all the benefits they should for adjacency to applicable situations.
Credits: donald23