There is currently a Kickstarter for the Batman: Gotham City Chronicles TTRPG.
It’s a bit confusing because it also includes “Season 3” of the board game (Which is also awesome) The Kickstarter is actually a great way to catch up on the board game (which I have featured in a different post)
The TTRPG is based on a d20 system that’s popular in France. It’s similar to a very streamlined D&D 3.5. There is a Quick Start on the Kickstarter page.
Check it out here:
Gotham City Chronicles