Euphoria engine was a powerful physics engine which we generally know from Rockstar’s games. It’s one of the most detailed physics engines but wasn’t used commonly. Because it was expensive and too complicated to integrate to game engines (generally big companies doesn’t even use common game engines).

Unfortunately NaturalMotion ended licensing Euphoria engine with other tools in 2017.

Here’s another demo video: https://www.youtube.com/watch?v=RYoMLC7BS0E

Example for games which used Euphoria engine:

• Grand Theft Auto IV and DLCs (Rockstar integrated Euphoria to their own game engine (RAGE) and GTA4 was their first game with it.)
• Grand Theft Auto V
• Red Dead Redemption
• Red Dead Redemption 2 (So generally all Rockstar games after Euphoria. )
• Star Wars The Force Unleashed (Not completely uses Euphoria. There are three engine in SWFU.
• Havok engine for controlling the movement of objects, DMM engine for regulating what objects are made from what substances, and the Euphoria engine for deciding how enemies react to their environment used in the game. You can look here for detailed explanation.). Here’s a Euphoria demo video for The Force Unleashed.
• Star Wars The Force Unleashed II