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The Open Challenge 2026 topic was Flight. The Paper, Results and Solutions for this year's competition can be found in the table below. The prize-giving this year took place at Liverpool University on Wednesday 6 May The Open Challenge 2025 topic was Sweets. The Paper, Results and Solutions for the 2025 Paper can be found in the table below. ---- ---- ---- !! Here is a selection of past papers and solutions: | | |>> *Questions* <<| | |>> *Solutions* <<| | |>> *Topic* <<| | |>> *Results* <<| | | 2026 | [PDF](OpenChallenge_2026_Questions.pdf) | [PDF](OpenChallenge_2026_Solutions.pdf) | Flight | [PDF](OpenChallenge_2026_Results2.pdf) | | 2025 | [PDF](OpenChallenge_2025_Questions.pdf) | [PDF](OpenChallenge25Solutions.pdf) | Sweets | [PDF](OpenChallenge_2025_Results_1.pdf) | | 2024 | [PDF](OpenChallenge_2024_Questions.pdf) | [PDF](OpenChallenge_2024_Solutions.pdf) | Constellations | [PDF](OpenChallenge_2024_Results.pdf) | | 2023 | [PDF](OpenChallenge_2023_Questions.pdf) | [PDF](OpenChallenge_2023_Solutions.pdf) | Ancient Egypt | [PDF](OpenChallenge_2023_Results.pdf) | | 2022 | [PDF](OpenChallenge_2022_Questions.pdf) | [PDF](OpenChallenge_2022_Solutions.pdf) | Famous Artworks | [PDF](OpenChallenge_2022_Results.pdf) | | 2021 | [PDF](OpenChallenge_2021_Questions.pdf) | [PDF](OpenChallenge_2021_Solutions.pdf) | Nature | [PDF](OpenChallenge_2021_Results1.pdf) | | |