Chrome Dimension is an episode of the original Angry Birds, only seen in the online Google Chrome and Google+ versions of the game. Chrome Dimension doesn't appear in any other version.
Initially, all of the levels of this episode are unavailable. To unlock them, the player must look for Chrome Symbols hidden in the normal episodes. There are seven symbols hidden within Poached Eggs, three within Mighty Hoax, four within Danger Above, four within The Big Setup, and three within Ham 'Em High. The Chrome Symbols are analogous to Golden Eggs in the full version of Angry Birds. Finding one of these symbols will open up a level in the Chrome Dimension, which contain various colored blocks with images based on commands/buttons from Google Chrome, and boulders and bombs with the Google Chrome Logo (the later serving as the TNT Crates in the episode).