The top box lid is to sandbox, where the sand is stored during the game and consists of very thick cardboard. Although there are small, but contain very sweet ramekins in the game. The game stimulus is to create the molds sand figures and if a (diced) wave comes, repotting sand back from the board in the sandbox. For smaller children there is a very great fascination herein, where in my experience even three year olds can participate (age recommendation of the publisher: 4+).
The sand can of course also from other manufacturers without the board game buy and then operating under the name Super Sand, Kinetic sand and other names. Combined with the board game of sand for children is a wonderful experience and the long-term fun lasts long.
The nice thing about the board game is that parents like to play by play on small crab together with your children. Here, the children learn patience and then also to comply with rules. You will also be guided by the fascination of the sand very successful at board games. The game should be there for the sand anyway best always an adult.