Batman, Riddler trophies, Arkham City, 440 collectibles, various challenges, hidden puzzles, gadgets required, detective mode, urban environment, dark atmosphere, neon lights, gritty textures, Gotham architecture, third-person perspective, dynamic shadows, nighttime setting, interactive objects, game mechanics, exploration, stealth action, cape gliding, grappling hook, action-adventure game, detailed environment, immersive experience.