The first thing I want to say is that World of Goo first came to my attention by sharing their users statistics as a comment on video game piracy. Specifically they had sold one copy for every ten people submitting scores to their scoreboard. Which makes it sound bad, but there would be lots of reasons for this.
The first is that they offered the game on all three computer platforms. So if you have two different computers or even two different operating systems on one computer you would show up twice. Adding to this is that World of Goo is such a small program that transporting it on a usb key (or downloading it again) onto work computers or other systems is easy. So I think the nine out of ten people would steal a video game claim that was being made based on those stats is false.
I would also say that the numbers are no longer so warped. Thanks to 2d Boy pushing their game as hard as possible I’ve ended up owning three copies myself: One by buying the game direct from them, a second from the Indie Humble Bundle and the third was included on a Steam Indie bundle. So I’ve played World of Goo on seven or eight computers and own three copies. And the game is good enough I’m not upset about paying for it three times. (That and times I didn’t pay more then 25 dollars combined and got nine additional games.)
World of Goo itself is a puzzle game. At the start of each map they tell you the objective, usually get X number of goo balls into the pipe somewhere on the map. To keep the game interesting they keep introducing new types of goo to play with. But at first all your goo balls will do is stick together to build towers or bridges.
The game is mostly a physics puzzle engine. The goo balls stick together, but the mass of the tower being built is taken into account. You can build your tower to thin and have a strut break. Then you have an often heartbreaking scene as tower collapses, bouncing as bits of it hit the ground.
Some goo builds better, stronger bonds then others. Some goo can be removed from a tower as it is being constructed. Others are stuck once placed. Some goo is flammable, other goo is sticky. One type of goo is able to float upwards like a balloon. Other goo can form long chains.
No map has more then three types of goo on it, which helps keep the game focused. The maps are interesting and colourful. And while you do return to some puzzles, the map and the challenges have changed. These changes are in line with the storyline as well.
Each chapter consists of a score of maps. Each chapter is based on a single theme. And as you complete each chapter you see a story unfolding. You see the goo attempt to understand industrialization and even escape into a virtual computer system. The instructions for each map are written on little signs usually whimsically written by an unseen game character called ‘The Sign Painter.’
I quite enjoy the game, and steam tells me that it took six hours for me to finish it this time. I have finished it twice more, but I’ll not count those for assigning the valve of the game. With six hours and finishing the game gives it a value of $11. I don’t think I’ll keep the game installed on my computer, but I could see myself returning to it eventually.