Let me Wiki that for you. SCHG_How-to:Extend_the_water_tables_in_Sonic_2 After that, you'll need to do two more things. One is to create an underwater palette for the level. After creating the palette in SonED2, you can look at the way water palettes are usually loaded in the ASM file and follow suit, or you can write it directly into the appropriate spot in RAM if that gives you trouble. The other thing to do is to put one of the two Water Surface object graphics in VRAM and edit the object's code (Obj04) to load it. A third, optional thing to do is to give it a dynamic water routine such as the one in Chemical Plant 2.