Thank you very much for your answers.

I also think Nightmare Troubadour is a good start to know the basics of yugioh rules.

And the puzzles section is excellent for teaching advanced techniques.

Bye.

as long as you make it clear that they should not take the game as being an official sorce. there are always errors in the games, even if the games are made by the same company that makes the cards, its not perfect.