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The Bebras Challenge is an International Challenge on Informatics and Computational Thinking (CT). The goal of the challenge is to make students interested in Computer Science (CS) and CT. The authors let students participate in Bebras in regular Informatics classes at a high school in Japan. Not only involving the challenge, but we also implemented a learning activity which students create original Bebras-like problems. The learning activity aims to make students recognize that materials for algorithmic thinking are around them. Most of the students worked well and produced idea full problems. They created many great works. And some of them were selected as Japanese representative questions for the International Bebras Task Workshop by the Japanese Committee for the IOI, which conducts the Bebras Challenge in Japan. Some of them were used in the actual Bebras Challenge. In this report, we show the students' original questions and discuss the educational effect of this learning activity.

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