These tasks requires the use of a website created by MIT and is a fun way to learn code. Happy Scratching.
Scratch Website link. This is where you can find the webbased software.
Here are some links to Youtube - How to Scratch videos
Good basic introduction to Scratch - LINK: Basic - first creating - story
Very good basic introduction to Scratch - LINK: Basic introduction to Scratch
Basic to intermediate level - Part 1 - platform gaming LINK:- Basic to intermediate level - Getting Sprite moving
Intermediate level - Part 2 - adding the platforms -LINK: Intermediate level - Getting Sprite jumping on platforms
Intermediate level - Part 3 - next levels and collecting crystals LINK: Intermediate - levels and collectables
Intermediate and advanced level - Part 4 - score keeping - LINK: Intermediate/advanced level - Score keeping
This link starts off basic, but quickly moves on to advanced features. LINK: How to Scratch - Basic to very advanced