Particle tracks in the Metis VL cosmic-ray matrices gathered in 2022. Top-left panel represents a single fired pixel associated with straight tracks, while the top-right panel shows a typical slant track. The bottom left and right panels report a square and an exceptional composite track, respectively. Both squares and composite tracks are considered to be formed by pixels in the same line crossed by the incident particle and extra pixels fired by photons and knock-on electrons generated along the main cosmic-ray track. Future works will allow us to verify this hypothesis.