Download Rubik's World -

You can use software like DeSmuME or MelonDS to run the DS version on a PC, provided you have the legal right to the game's ROM file.

Since the game was a console exclusive, you can find it through the following methods: Download Rubik's World

You can buy used physical copies of the game on platforms like eBay or Mercari . You can use software like DeSmuME or MelonDS