Portal 2, as a full-fledged retail product, was officially announced by Valve last week and today we have more juicy rumoring about the game.

Co-op gaming is interesting enough but Shacknews is also thinking it may include a level painting hook.

Reason? The latest issue of Game Informer, with Portal 2 on the cover, made mention of "using special paint that gives unique physical properties to surfaces (eg rocket jumping, speed bursts, etc)," commented Shacknews forum member Masem.

Sounds very similar to what the DigiPen team behind Tag: The Power of Paint was working on...