I bought Rayman Forever from Gog.com.
I wonder if there is a HD addon for this game?
closed as off topic by Wipqozn, OrigamiRobot, Ashley Nunn♦, StrixVaria♦, Jupotter Mar 31 '12 at 18:25
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No, there does not appear to be any mods that give graphical upgrades to the game.
Remember, this game was originally designed to work well in DOS, and technically the GOG version is just bundling the game with DOSBox in order to get it running on your system. That it looks old and pixelated is to be expected.
However, since it is a DOSBox application, you can change the way in which the graphics are scaled up to your monitor's resolution by editing the config files. According to the GoG forums, the config file is in the same folder as the game itself. You can read up on the configuration file syntax on the DOSBox wiki. I'd suggest trying different values for the "scaler" entry under the "render" category.