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.

la machine is a new take on the Useless Machine: flip its switch and an arm emerges from the box to switch itself off again.

But it does not turn itself off the same way every time. The arm may emerge immediately, hesitate, move slowly, or combine its movements with different sounds. Sometimes it resists interaction; at other times, when left alone, it may extend its arm to seek attention.

Thousands of behaviors are available, and the machine is designed to develop a different “personality” over time as it is used.