The first time you place treats in all the hollows. Let the dog be present and watch. Place the blocks so that some treats can be seen between some blocks. Tell the dog to "go ahead" and allow the dog to try and find the treats by itself. If the dog does not understand, point with your finger to a treat in a hollow. Praise the dog immediately when it does things right.
When the dog has understood what to do you can hide a different number of treats each round, and it depends on the dog how many rounds you manage to do in a certain time.
If the dog tries to bite the game or the pieces, then put your hand over it and stop the game. When the dog has calmed down you can tell it to go ahead and let the dog try again. If the dog repeatedly wants to bite, then teach it to work only with its paws. If the dog rather wants to throw itself on the game and beat excessively with its paw, then teach it to work with its nose by putting the game on a stool/chair which is adapted to the size of the dog. This is also useful if the dog has an injured paw or if it has just had an operation.

Increase the degree of difficulty by placing the white plastic blocks in the depressions in the middle of the dog Casino. One can tie a string through the holes in the blocks to make it easier for the dog/cat to lift the blocks away. Should your dog have an injured paw, for example, you can place the game on a stool to make the dog work with its nose only.
Meaty ice cream: Mix some meaty dog food with water, pour some of the mixture in the hollows, put the game in the freezer and let it set. This is perfect for hot days or when the dog needs some extra activity. Note: only under strict supervision.
Puzzle toys are great for ferrets too!