Based on your query, I would recommend using a combination of Scratch and Lessonplans.ai to create engaging lesson activities on binary for your Year 9 students.

Scratch is a free platform that allows students to learn coding through the creation of interactive stories, games, and animations. It uses a block-based programming language, which is perfect for teaching binary as it eliminates syntax errors and allows students to focus on logic and problem-solving. You can create a project where students have to use binary to solve certain tasks or challenges, making the learning process interactive and engaging.

On the other hand, Lessonplans.ai is an AI-powered lesson plan generator that can help you create a detailed and efficient lesson plan on binary. You just need to provide the topic, grade level, and objectives of your lesson, and the AI will generate a complete lesson plan with engaging activities and resources. This can save you a lot of time and effort in lesson planning and preparation.

By using these two tools together, you can create a comprehensive and engaging lesson on binary for your Year 9 students.