Cataclysm: Bright Nights is an open source fork of Cataclysm: Dark Days Ahead. Bright Nights emphasizes game balance and interesting combat with heavier sci-fi aspects over grounded realism focused simulation of Cataclysm:DDA. Additionally Bright Nights contains a lot of rebalanced and reworked game mechanics, optimizations and Quality of Life features to make gameplay more fluid and enjoyable.