Puzzle board having regular positions forming a two-dimensional field and a set of accompanying puzzle pieces, comprising a number of spheres connected to each other in a mono-axial, biaxial-orthogonal or hexaxial pattern, wherein each position is provided with a circular opening in the puzzle board, wherein the spheres correspond to the openings in the puzzle board, and wherein it is intended as a puzzle to cover all positions with the available set of puzzle pieces wherein the puzzle board has one or more blocking grooves, wherein the blocking grooves connect the openings of multiple adjacent positions of the puzzle board, and wherein each blocking groove comprises a blocking piece, movable through the blocking groove and intended for blocking a position of the puzzle board in the blocking groove, and wherein the location of the blocking grooves on the puzzle board is determined such that the puzzle always has at least one solution for each blocking arrangement.