A solid fuel gasifier includes first wall structure defining a gasification chamber and means to collect particulate solid residue from gasification in the gasification chamber. The swollen multi-stage polymer has low dry bulk density, as measured by centrifugation. In an embodiment, the player has an option to select one or more side-bet via a pop-up window prior to game play initiation. The end segment of each selected song is characterized, and the first segment of a candidate song that satisfy the overall selection criteria is compared to this characterization to determine a correspondence. A positive-acknowledgementnegative-acknowledgement is received from the wireless communication device. In one implementation, the pinning strength of the pinned layer is substantially reduced.