Like widescreen resolution, advanced NPC screen, 50 pages in Personal stash and 10 pages in Shared stash of 10x10 size, O Changed UI and massive core improvements. Diablo 1 HD keeps the original game's atmosphere while revitalizing it. It modifies the game by enhancing resolution, adding new playable classes and skills, improving items and monsters, and enabling unused quests and items. Diablo 1 HD is an unofficial modification, for the original Diablo game without the Hellfire expansion, so far.