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 most cases, players are eliminated when he/she tops out, and the last player (or side) standing wins the round. The DS version of 15th Anniversary supports all multiplayer modes that the DS officially supports. In this mode, players without a copy of 15th Anniversary can play along with those that do. The only difference between playing with a copy and without a copy is that the download and play version does not contain voices or battle animations. The game is functionally compatible, for the most part. Therefore, both the DS Download and Play modes and direct connection modes are accessible