Valve is kicking off the recent release of SDK libraries for Portal 2 in a big way, announcing a contest called the 2011 Summer Mapping Initiative. It invites designers to craft original maps for Portal 2, of either the single-player or co-op variant.
Up for grabs is an Ultimate Portal 2 Gift Pack signed by the Portal 2 developers[...]
Continue reading: Portal 2 Summer Mapping Initiative Contest Announced...