Newer versions like Night High 5 and Night High v4.0 feature updated engines (such as Unity) and improved art compared to the early releases. Chronology of the Full Series

The first entry that established the stealth interaction loop.

Players must use clicks and drags to interact with characters. Success depends on staying quiet and avoiding sudden movements that would alert the sleeping girl.

The most recent major release, featuring multi-touch support and refined controls. Night High! : Denji kobo - Internet Archive

The "full" series consists of five main numbered entries and various "RE" (revised) editions: