Haunted Hallways is the 1st Movement of A Haunted Tale Volume 1. This piece contains chromatic harmony, triple meter, & arpeggios (triads & 7ths).
The technical elements are of this piece would make this fall into Grade 2 (Late Beginner-Early Intermediate)
It can be also learned via rote as a Late-Elementary to Early-Intermediate Level student (at least 1-2 years of study).