The game is based on the basic mechanic of building structures using blobby balls of goo. Each puzzle asks you to build a structure large enough to reach that level’s exit pipe. The challenge comes from building with few enough balls so that you can meet that levels exit quota. As you play through the games five chapters, a greater variety of goo balls and environmental hazards are introduced, and the game is consistently challenging as it introduces these new elements, forcing you to think in new ways. Re-usable green goo, rope building white goo, elevating balloon goo, and even digital goo right out of the Internet are just a few of the many variations, and you’ll have to deal with even more hazards, from spikes to fans to grinding gears, etc.

The five worlds guide you through a narrative of discovery and wonder as these goo balls escape the World of Goo Corporation and explore the world around them. Gameplay hints and tips as well as bits of story are told through interactive sign posts in each level, all left behind by the enigmatic personality known only as “The Sign Painter.” All the goo balls you suck up throughout the campaign are made available at the Goo Corporation headquarters, which changes appearance based on your current progress. Here, you are tasked with building a structure as high as you possibly can with the freedom to do so in any way you see fit. The tower heights of other players and friends are marked, courtesy of OpenFeint, giving you a measuring stick to work against. Completing each puzzle with the “OCD” number of goo balls remaining so you can build as high a tower as possible is a big part of the fun.

The game has a fantastic art style, and the world these goo’s inhabit is full of strange and abstract sights to see. The sound design and music are fantastic, and only reinforce the game’s tone. The story is surprisingly memorable despite lacking any real characters. This is a multiple award winner for a reason, and anyone would be foolish not to at least give it a chance. You can add it to your library for just five dollars, which it is more than worth. You could also download the free demo if you remain unconvinced. Seriously though, you know what you need to do.