Embodiments of a microfluidic assembly comprise at least two adjacent microstructures and a plurality of interconnecting fluid conduits which connect an outlet port of one microstructure to an inlet port of an adjacent microstructure. A nitride film containing at least Al is formed on a 6H\u2014SiC base by CVD at a temperature of at least 1100\xb0 C. Some software-based player tracking methods of the invention can aggregate data from multiple devices used by a player for gaming.