Which books do native Polish people in Poland use to learn Polish?

Of course not.
I am talking about Mr Buggy.

He`s :
intelligent coz he is able to solve various riddles and mysteries
knowledgeable coz he studied history and art and is a full time worker of a Historic Department in the Ministry of Culture.
caring coz he cares about his friends and helpers and protects them from rogues.
brave coz he faces danger without hesitation whenever necessary
reliable coz he doesn`t cheat, lie, manipulate. .
determined - coz he doesn`t rest until he finds the hidden lost treasures.
adventurous and crazy - it is easy to do when you possess such a curious gadget as his car.

Shyt! This means he is perfect.

I have always liked such heroes. True role models for young readers. HA!

Somewhere in the middle of the series, the author introduces the second gadget, living, for a change - namely an amazing specimen of a Great Dane. The dog initially tries to dominate Mr Buggy and he worries about his position in the house but with passage of time they become good friends and cooperate nicely to catch artifact thieves.

This cover version of the book I borrowed from my school library seems the most attractive

Mr Buggy and the Mother of all Mysteries.

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