The game is a first-persondungeon crawlerrole playing game where the player guides a party of Blood Maidens through living dungeons in order to reach each one's boss, the titular "Nightmares." When in battle within the dungeons, each Blood Maiden has a Blood gauge that lets them enter Massacre mode in order to temporally raise their stats and give them bonus skills. If left unchecked, however, the Blood gauge will cause the Blood Maidens to go into Blood Skelter mode and uncontrollably attack friend and foe alike.
Plot
The story starts with the main characters Jack and Alice escaping from a jail cell with the help of a group of supernaturally powerful girls called Blood Maidens. It turns out the entire city has been absorbed by a malignant being known as the Jail, and it has been releasing hostile monsters called Marchens. Realizing he has the power to assist the Blood Maidens, Jack joins their forces in order to escape the Jail.[12]
Mary Skelter: Nightmares received generally favorable reviews. It received an aggregated score of 70.80% on GameRankings based on 10 reviews[13] and 76/100 on Metacritic based on 14 reviews.[14]
Hardcore Gamer's Chris Shive gave the game a 3.5/5, saying that while the game, "won't blow anyone away", it was still "a well put together, enjoyable experience."[15]