Chain Reaction is a barrels-themed single player WAD for Doom II (Map 01) that I created in the last few weeks, like many of us making use of the extra time at home this past month or so. The central theme of this map is barrels, combining them with other Doom features such as crushers, scrollers, platforming, and combat scenarios. The map is roughly of medium length, and makes use of vanilla Doom II textures only. The map is very challenging, hence you may prefer to start on HNTR or HMP, unless