This app is well designed with clear instructions on what they need to do. It can get tricky in some levels, but it is nice to start for kids to learn how to give instructions

Ref: Lightbot

This app is one of the best well designed and fun app for kids to play and learn coding. This also has a section that help kids to make a game or story by using instructions.

Ref: CodeSpark

This app has better graphic and animation compare to Lightbot and has a better story to follow. But in some levels it can get a little difficult

Ref: SpriteBox

This app will give the kids the freedom to build what they like with very easy and simple tools. They can make a game and play with each other. This is the very beginning to the coding world.

Ref: ScratchJr

This code.org website is very well designed with nice curriculum and tutorials will guide kids through the steps.

Recommended course

Grade 2: Course C https://studio.code.org/s/coursec

Grade 3: Course D https://studio.code.org/s/coursed

Ref: Code.org

This nice, cute and fun robot, is one of the best robots to help kids to learn how they can give instructions to a robot and write a program by putting actions steps by step together

Ref: Wonder workshop