Shadow of the Colossus remake uses 'original game code

This was confirmed by Bluepoint Games.

Shadow of the Colossus Remake's Secret Found - Cheat Code Central

Shadow of the Colossus review - Polygon

Shadow of the Colossus' Remake beginner's guide

Shadow of the Colossus PS4 Remake Changes You May Not Notice

The Shadow Of The Colossus Remake Is Stunning, But Does It Do The OG Justice? - Supanova Comic Con & Gaming

Review: 'Shadow of the Colossus' is one of the best game remakes yet

The wonderfully empty world of Shadow of the Colossus

Shadow of the Colossus Remake PS4 vs HD PS3 (First 15 Minutes) : r/Games

Secret Sword Discovered in 'Shadow of the Colossus' Remake

Shadow of the Colossus' is the perfect remake for newcomers and old fans alike