An improved floating circular hull construction arrangement. A switchable amplifier is present between signal input and signal output and is provided with an input, with an output and with a negative feedback path having at least one resistor between input and output. Nicarbazin is easily administered, for example by simple addition to feed of an animal and is and non-toxic to the animals, providing a safe and efficient means for controlling populations of mammals and avian species. The player can elect to modify the original award using a plurality of methods to create an ultimate award. The sheet of material may be constructed of waxed tissue, non-waxed tissue or a tissue substitute, such as a tissue having a texture or appearance simulating the texture or appearance of waxed tissue.