Yes Martin is right!!! My cousin has one of these and we used to play a lot as kids... its a jigsaw puzzle with small plastic pieces, flat on the one side, and with four small, how should i call them, spikes on the other.
The spikes help the small piece to sit on the board, which is actually a board with many tiny holes so that the pieces can fit, or better, inserted , with the spikes, in the holes... thus producing the whole image...
If that makes sense...