Crystal structure "white tin" respectively. Two more allotropes, γ and σ, exist at temperatures above 161 °C and pressures above several GPa. White tin is metallic, and is the stable crystalline form at or above room temperature. Below 13.2 °C, tin exists in the gray form, which has a diamond cubic crystal structure, similar to diamond, silicon or germanium. Gray tin has no metallic properties at all, is a dull gray powdery material, and has few uses, other than a few specialized semiconductor applications. Although the α–β transformation temperature of tin is nominally 13.2 °C, impurities (e.g. Al, Zn, etc.) lower the
Puyo Puyo! 15th Anniversary with your friends using the Friend Code system or against random opponents. When playing random games, three-player mode and the original Puyo Puyo rules are not available, and you can earn (or lose!) points if playing a two-player game. Puyo Puyo! 15th Anniversary for the DS had several issues. In the original release of Puyo Puyo! 15th Anniversary, a bug existed where data would could not be saved more than 255 times. A new version, nicknamed 1.1, was released to solve the problem on January 20, 2007. Information on how to find out the game version and instructions on how