Please follow the below steps to create a new playground:
- Login Trailhead
- Click on your Profile Image from the Top-Right Corner on Trailhead Page
- Select 'Hands-on Orgs' or go to https://trailhead.salesforce.com/users/profiles/orgs
Click Create Playground button to create a new playground and then click Launch button to open the org.
公式のページを回答しているのに、嫌がらせの見本のような例だな
1). I found that opening the "launch" can be done if you drag your cursor over the kebab menu.