Time for action – creating the Retina version of the tile map
Just as with many other resources used in Cocos2D games, you need to have several versions to support non-Retina and Retina displays. Luckily, we don't have to create a separate tile map for 3.5-inch Retina and 4-inch Retina displays. Also, we won't have to repeat all the steps and recreate a tile map using a different tileset.
You need to understand that tile maps for Retina and non-Retina displays will only differ by size of images used in them, and the layout of the tiles should be the same; of course, if you don't want to display different levels for Retina and non-Retina displays.
However, normally, you'd have to create two versions by simply repeating all your work and placing ...