The millions of Goo Balls who live in the beautiful World of Goo don't know that they are in a game, or that they are extremely delicious.
World of Goo is an indie Puzzle Game by, essentially, two guys, with some help. In it, the player constructs intricate structures from intelligent globs of goo, with the deceptively simple goal of leading the remaining free members of the swarm to each level's exit pipe. Deceptive, because this two-dimensional world is contrived to put as many highly varied obstacles into your path as possible.Spun off from the simpler Tower of Goo student project, the gameplay is pushed into an increasing variety of directions by the long string of newfound species of goo, each possessing unique properties to experiment with. The slowly building story is told through a deliberately primitive, child-like art style in the rare cutscenes, and more profusely through the text of helpful signs posted in each level by Your Friend The Mysterious And Enigmatic Sign Painter.The whole of Chapter 1 is in a free demo for Windows/Mac/Linux, and the full version can be bought and downloaded straight from the website, or through Steam or Big Fish Games. There's also a Wii version available through WiiWare. A bonus sixth chapter on the Moon was originally planned for retail, but may or may not ever get made.Do not confuse with Word of God, even though it may apply.
But Thou Must: In Chapter 4, you are asked for confirmation on undeleting all of MOM's junk mail. The two choices are "ok" and "yes."
Also, in the same chapter, if you try to get MOM to erase the cookies concerning your personal data, she accepts, then informs you that they may in fact not have been entirely deleted, and... you're back to the beginning of the discussion tree.
Chekhov's Gun: At the end of the first world you send a tower of goo with eyeball balloons into the sky. They later appear at the end in space.
Dem Bones: One species of goo confuses the Sign Painter as to whether they're "alive... or dead. Probably polite to pretend we don't notice." These skull-shaped goo are the only species invulnerable to the ubiquitous Spikes of Doom.
Does This Remind You of Anything?: The goo is a black, viscous, gooey substance which is crucial to the economy note ...extracted from various distant regions of the world through pipes and made into lots of consumer products by a large, faceless corporation. The subtlety — it burns! (Guess what else burns.), kind of like some other black, viscous, gooey substance in real life!
Sequence Breaking: You don't have to burn the man to complete the level. Or sacrifice any of the goo balls in Red Carpet level. Since it's a physics-based game, people have discovered tricks to break some physics in his game to allow players to get way above OCD requirements of some levels.
Shareware: The PC demo allows you to play through the entirety of the first chapter with no restrictions imposed, but you will need to actually buy the game to continue on. The Wii demo doesn't count as shareware since you cannot save and it automatically terminates at a certain point.
The introductory text for the fourth level contains a shout-out to Armadillo Run, another indie puzzle game with a similar premise. This borders on a Lampshade Hanging: the sign in that same level mentions an armadillo for no apparent reason.
A sign in "Ode to the Bridge-Builder" references the song "O Superman" by Laurie Anderson. Also Bridge Builder is one of the Chroniclogic's physics-based construction series. ODE is actually a physics engine World Of Goo is largely based on.
Videogame Caring Potential: Swinging back around, of course, with the practice of playing a level specifically to save as many Goo balls as possible. By using lots of tricks, you can save much much more of them than intended.