Riddle me this

That maniac the Riddler struck again today. Why they keep letting him out of the asylum, I’ll never understand. He rigged a pair of city buses to explode. The only way to stop it was to enter the proper code within two hours – a code only obtainable by solving a series of ridiculous riddles. Thankfully, my language skills are pretty good for a pug, and I got the code in time. God help us all if the Riddler ever discovers Sudoku.