Batman: One Bad Day – The Riddler is a brilliant exploration of Edward Nigma's descent into villainy. Inspired by The Killing Joke's "one bad day" concept, it dives into what pushed him over the edge. In 88 pages, we see a terrifying version of the Riddler—unpredictable and dangerous when he no longer follows his own rules.

While the story was a bit confusing at times, it quickly pulls you back in, rewarding careful attention. The open-ended conclusion is haunting, leaving enough ambiguity to let your imagination fill in the gaps. Overall, it’s a powerful, character-driven take on one of Batman's most iconic villains.