If you loved Code Geass: Lelouch of the Re;surrection, try Code Geass: Lelouch of the Rebellion III - Glorification
A bridge between a film you've already seen and one most people haven't. Code Geass: Lelouch of the Rebellion III - Glorification has roughly 4.7× fewer votes than Code Geass: Lelouch of the Re;surrection — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

Code Geass: Lelouch of the Re;surrection

Code Geass: Lelouch of the Rebellion III - Glorification
What they share
Both films are directed by Goro Taniguchi, and they both carry the cerebral mood tag, and they sit in Animation / Science Fiction territory. If that's the register that drew you to Code Geass: Lelouch of the Re;surrection, the second film will land in a comparable space — through a different lens.
What Code Geass: Lelouch of the Rebellion III - Glorification is
You’re Zero behind the mask when the Black Knights stop believing in the rebellion. Suzaku won’t answer calls and Nunnally’s gone. Then the empire tightens its grip. The director’s anime from the late 2010s turns the hero’s gamble into a losing streak.