Pretty much builds on everything introduced in arkham asylum. Excellent freeflow brawling, probably the best arkham game for predator gameplay, contending with arkham origins. The arkham game with far and away the best side missions, the best riddler challenges, the best story and again contending with arkham origins for the best bosses. This is what i call a perfect batman game. Kevin conroy and mark hamill are better than ever and the ending is fucking amazing. Catwoman is a great addition and the side missions introduced story threads so interesting and cool that they managed fuck up all of their follow ups in Arkham knight. I will also say that the open world is pretty great for the most part. Its rich with depth and interesting places to go and explore. The environments and character designs still hold up and look better than they do in the awful return to Arkham remaster. I spent like a whole year as a kid just playing this game and i love it.