Ode to the Bridge Builder (OCD) - World of Goo Walkthrough

To get OCD in this level you need to collect at least 38 Goo balls.

This level is a more difficult version of the level Small Divide. Make sure to brace your structure against the cliff in the beginning. Your structure is going to bounce up and down a lot which will put it at risk of collapsing. You'll probably have to use a Goo to support your structure midway, but try not to use more than one for this. If your structure does collapse then use a time bug or two to fix it.

In this level you are not able to wake the sleeping Goo by knocking them into your structure. Instead you must build your structure close enough for them to awaken so keep that in mind when you're building near the pipe.

Also, be watchful for any Goo that try to kill themselves by jumping off of your structure. They have a tendency to do that sometimes.

グーの惑星の攻略 - ブリッジビルダーのテーマのレコード方法

[StevenBedoya]

I actually got the OCD by going up an then letting the tower to fall over to get the bridge built. But that's actually a really nice and simple technique bro!