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Above:Version "Blinking Eye"
Click a thumbnail to see its larger version and description.
A puzzle with a unique mechanism that came in at least four different versions.

The Brain-chek puzzles consist of a 4x5 square grid and a slider that can move along the edges of that grid. Each square has a marker that changes whenever the slider moves along an edge of that square.
There are several versions and with different colours.
Images 1-2 show "Blining Eye", a version where the noses change from red to rose.
Image 3-5 show the version PhD (here without the name) that has both arrows and dots. The arrows have three states, and turn one step in the same direction as the direction you move the slider along an edge. The dot in the center only has two states and changes with every move along the square's edge. Combined, the arrow and dot give each square six states.
Images 6-9 show an improved version of PhD where one can select the difficulty by choosing one of three sliders. One slider changes only dots, another only arrows, the third changes both. The sliders are stored in little compartements at the top of the puzzle, and can be inserted onto the grid by removing a small piece of the bottom edge of the frame.
According to the package its name is "Magic Path".
Images 10-12 show the version "Stoplight" that comes with three states per square.
The year given here is an upper bound based on the purchase by the friendly contributor of the images.



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