Issen Boy is a 1.1 cm-square handheld game console built around the world of Issun-boshi, combining light, Japanese-inspired design, and electronics. The tiny circuit board implements the functions of an actual game console, including an input method that makes it genuinely playable.

The project was created by Yugi Tech Lab and won the grand prize in DigiKey Make ONE Challenge 2026. Its ProtoPedia page also lists the team's roles, including overall software, hardware, planning, and implementation by Yugi Tech Lab, AI work by KIRA_YTL, and 3D CAD work by mackey_YTL.