Zenji is a puzzle game that inspired other similar games years later, like Pipe Mania.
The idea of Zenji is to give the source access to all of the maze corridors. Move the face to a chamber and rotate the maze pathways to allow the green energy from the source to flood the maze. All of this has to be done against the clock, and later levels become more complex. Completing a level and connecting with the source is referred to as making a Zenji.