If you need to build across a gap and are not provided balloons, try building up and adding weight to drop your structure to the other side, rather than building straight across and ending up with it dropping into the gap.
Mobile Gaming eGuide - Tips, Tricks, and Strategies for Today's Hottest Mobile Games World of Goo
If you need to build across a gap and are not provided balloons, try building up and adding weight to drop your structure to the other side, rather than building straight across and ending up with it dropping into the gap.