Your students can take part in an Hour of Code online with an app for Android and iOS. Rodocodo is a free puzzle game and a perfect way to introduce your KS1 and KS2 students to the world of computer science.
You do not need to know anything about coding to get started. There are 40 levels to complete and each level with video tutorials explaining what you need to do and why. You will have access to the game, a teaching guide and a certificate that you can print out upon completion.