Answer:
Backward chaining
Explanation:
Backward chaining is described as a procedure in which an individual or learner starts to perform a specific task and complete the last step of the given task analysis. It says that an individual will learn or perform every preceding step either with or for the learner and after that he or she begins to fade his or her prompts after reaching the last step.
As per the question, Mr Worms is using backward chaining.