It was only this weekend that I was first introduced to Decimal Defender, an educational math game published by TI Education for the TI-83 Plus/TI-84 Plus calculators (available for download on their site). You control a spaceship, numbers appear at the top, and a math problem involving multiplying or dividing a number by a power of 10 appears at the bottom. You need to shoot the spot where the decimal point should go. Each wrong answer loses you a life. I figured it would be a fun little xLIBC program to write, and educational to boot, so I have a tentative spritesheet and have started writing the game. I'll update this topic as I make progress.