[Projectshifter]

Hmm... need to know what it is used for. If it's just a temporary animation where the player is not actually moving but appears to be moving, then you could just do a gani and would be better done graphically. However, if it's where the player actually moves, there are a couple ways to do it. I don't see why you wouldn't just do regular large levels, bu the second way is to constantly do updateboard clientsided and have it do something such as tiles[x,y] = tiles[x,y-1]; to get the tile right above it. Need more information on what you're wanting to do.
-Projectshifter