Acknowledgment

As part of the ice-breaking activities, we incorporated several logic puzzles adapted from the official Face-off Puzzle Battle website: https://face-off-puzzle-battle.logicpuzzle.app/. And we also used Sudoku puzzles from the Genuinely Approachable Sudoku (GAS) series, available through Grandmaster Puzzles: https://www.gmpuzzles.com/.

Puzzle sources

Several logic puzzles were adapted from the official Face-off Puzzle Battle (FoPB) website:

https://face-off-puzzle-battle.logicpuzzle.app/ (Japanese)

Relevant puzzles appear under the 「使用問題」 section, including:

• Online-Loop 2: Numberlink
• Online-Object 3: Akari
• Online-Region 1: Shikaku
• Round1-5: Nurikabe
• Round2-5: LITS

We sincerely thank the creators and organizers for making these puzzles publicly available.

Sudoku sources

Sudoku puzzles come from the Genuinely Approachable Sudoku (GAS) series on Grandmaster Puzzles:

Main website: https://www.gmpuzzles.com/

Original Sudoku problem links:

• https://www.gmpuzzles.com/blog/2026/04/sudoku-by-philip-newman-9/
• https://www.gmpuzzles.com/blog/2026/04/sudoku-by-philip-newman-8/
• https://www.gmpuzzles.com/blog/2026/04/sudoku-by-bill-murphy-6/
• https://www.gmpuzzles.com/blog/2026/02/sudoku-by-bill-murphy-5/
• https://www.gmpuzzles.com/blog/2026/01/sudoku-by-philip-newman-6/

We are grateful to the puzzle authors for their accessible and enjoyable Sudoku content.

Use of materials

These resources were used exclusively for non-commercial purposes as part of the event activities. If you enjoy these puzzles and Sudoku, we encourage you to visit the websites above for the original content.

We would also like to thank all friends, contestants, and community members who contributed ideas and suggestions for the event activities. Their creativity and support played an important role in making the event more interactive, lively, and memorable.