Do you think it is possible to save a queen from the dungeon she is locked in with mathematics? Aleks was very happy when he realized that the strange pen he found on the road could solve even the most difficult math problems. Then, a mysterious book appeared on his bookshelf and almost captured both him and his friends Sam and Vanessa. According to the book, Emerald Queen Jayden, who was imprisoned in her castle by the evil King Rechner, had to solve 400 riddles in order to open the locked doors. Only children could help the queen. However, it seemed impossible to solve the increasingly difficult math riddles.

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