Designed and made by Minoru Abe, circa 1985.
(cardboard box 4+7/8" x 4+7/8" x 3/4", wood tray and 10 pieces, wood keeper and directions)

As shown in the directions on the left below, two 1/2x1 pieces and the 1x2 piece between the N and U are glued to the tray, and cannot move. Remove the 2x2 keeper piece and slide the pieces so as to exchange PINK and BLUE, leaving the blank 1x1 piece back in its original position:



The following pages show a solution of 190 moves.

Made in Japan 2013.
(cardboard box 4.3" x 4.3" x 7/8", wood tray, 10 wood pieces and wood keeper)

Designed by Minoru Abe, made in Japan 2013.
(cardboard sleeve, Cherry tray, fixed 1/2x1's and 2x1 painted green, Oak PINK,
Bloodwood BLUE, Cocabola 1x1 & 2x1, black plexiglass keeper, 5"x5"x3/4")

Here is the starting position, every 8th step, and the final position of a solution of 190 rectilinear moves (233 straight-line moves):



(one rectilinear move = slide one piece along a rectilinear path)