Left 4 Dead is just another victim of Valve’s almost comical antipathy towards the number three, with the series seeing two brilliant entries in quickfire succession over 2008/2009 before it was left 4 modders. Who over the years have done quite the job, it has to be said, with a particular favourite being the mod that added Jaden Smith’s tweets to the game as deranged graffiti (also a shout-out to the one that replaces the Charger enemy type with Homer Simpson in his car).

Now, a new challenger approaches. Eight of them, in fact. The Blue Archive mod by HCHA for Left 4 Dead 2 adds protagonists and extensive stylings from Blue Archive, a popular gacha-style tactical RPG from Nexon Games that casts you as the “sensei” of an apparently all-female academy city, i…