Makecode / Micro:bit
Go to: https://www.microsoft.com/es-es/makecode
There you are going to find a code block editor and an emulator of the Micro:bit board as shown.
If you want the .hex file to upload in your Microbit, you can find it here: https://drive.google.com/file/d/1PxsaiR672PRuMIUjATxyyZB4Uiwu5ZXq/view?usp=sharing