When I visited Japan almost three years ago, I couchsurfed with a family in Tokyo, and a six-year-old walked me through making model food with a candy kit.
During this visit, Brian and I have been trying out similar kits with Theo. Luckily, even though all of the instructions are in Japanese, the pictures are mostly enough to explain the steps. (Often, the many, many, many steps.)
Theo loves the mixing and shaping – and, of course, the eating. I don’t love the amount of waste each box produces, but otherwise agree that it’s lots of fun.