Waves of the Undead, or WotU, is a megawad purely meant to be shorter and harder, levels go from fun and easy to infuriating. Prepare for zombies and especially barons and knights. If you thought Plutonia Experiment was normal, then this might be for you. There are very few secrets, which aren't too important. Some levels are slightly easier, such as Hangar 17, An Explosive Opening, and The Gift, however, there are harder levels, such as Inferno Inc. and An Explosive Sequel.

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WotU was made in Doom Builder 2, SLADE3, and WhackEd4. Doom Writer was also used. Freemidi.org is the source of the custom music.