The listing, TREMORS 6-Movie Digital Code has ended.
Just pulled this from the blu-ray steelbook I bought at Wal-Mart.
One code for all 6 TREMORS movies:
Tremors (1990)
Tremors II: Aftershocks (1996)
Tremors 3: Back to Perfection (2001)
Tremors 4: The Legend Begins (2004)
Tremors 5: Bloodlines (2015)
Tremors: A Cold Day in Hell (2018)