I'm playing a strange XBox Live downloaded game on my XBox 360. It's a strange game that involves exploring caves. The ground is always plain and divided in diferent polygonal shapes and parts. My character has to dig in each part, which then is identified on the map by a specific color. I start a cave and go to the far back of it. I start digging, but only get green floors. These floors meant I wouldn't receive points or advance on my level percentage evolution. I continue digging, getting all greens, until a part of the level is suddenly expanded. I get an achievement which gave me 0 points, called 0%. Suddenly, there's two people talking. One explains to the other that the achievement would be unlocked whenever someone got an expansion with 0% level evolution. I restart the game, later.