The center piece can only slide up and down. Pieces cannot fall out through the transparent top plate. More assignments on the back of the puzzle. Material MDF.
The nummers are covered with transparent foil. You can slide without damage.
18 different pieces consisting of 2 squares with tail(s) and or head(s).Various assignments in the box. Main assignment. Place the pieces in a 6x6 square and make 18 complete Christmas trees.Material cardboard pieces.
Old puzzle. Copy produced by puzzle design Ton Delsing.9 cardboard pieces. The puzzle was patented in 1911, This variation on Thurston's puzzle was used as an advertisement for soap. The idea was to arrange the cards so that each center circle contained four different colors and each half circle contained two.