Dangerous Jiisan to 1000-nin no Otomodachi Ja (危険なじいさんと1000人のお友達じゃ) is a Nintendo 3DS game developed by Nintendo and released in Japan on October 1, 2015. The game follows the adventures of an elderly man named Jiisan, who is on a mission to make 1,000 new friends. Players must explore the world and meet new people, while also helping Jiisan complete various tasks. Along the way, they must also help Jiisan avoid dangerous obstacles and enemies. The game features a variety of mini-games and puzzles, as well as a unique art style and a catchy soundtrack. The game also features a variety of customization options, allowing players to customize their character to their liking. Dangerous Jiisan to 1000-nin no Otomodachi Ja is a charming and unique game that offers hours of fun for players of all ages.