One of the big indie game sleeper hits has been 2D Boy's remarkable puzzle game World of Goo. However it looks like most of the folks who have played the full PC version of the game haven't been good enough to actually pay for it. According to a comment string on Rock Paper Shotgun, the developers have said that 90 percent of the full copies being played on PCs are pirated versions.

One of the 2D Boy team members, Kyle Gabler, stated they arrived at the number by "...looking at unique ip's that have contacted our leaderboard server for any reason, at least once." However he seems to have a good attitude about the whole situation, saying, "I know it sounds like a gruesome number, but we like to tell ourselves 'those people wouldn't have bought it anyway'. The good news is, some have mailed us, telling us they bought the game because they first pirated it and liked it. Hurray for (some) humanity!"

[Via Joystiq]