Formula of Rubik's Cube APP
English voice is using smartphone's Text to Speech. You can modify the speed of speech through the Language and Input - Text-to-Speech options in your smartphone.
If you already tired or almost give up using any other formula found in some other similar apps, just try this apps. Some people are able to solve their rubik only after they use this apps method.
Again, this is Rubik's Cube Tutorial apps, not Rubik's Game, but Rubik's Formula apps. You can not play Rubik's Cube using this apps, but you can learn to Solve Rubik's Cube using this apps. You will get a good Tutorial for Rubik's Cube.
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You can access the video tutorial in this youtube link : https://youtu.be/_wN9FcodUZE.