IMPORTANT: Use turbo mode!! (shift-click the green flag)
Press space to toggle fast render on/off. Fast render disables the ability to render tiles individually. Press keys Z, X, and C to toggle interaction mode. Z is viewing mode, X is edit mode, and C is blend mode.
Blend mode allows you to move the dots that create the color blend. Simply drag them to the desired location onscreen. You can also change the pen size in blend mode, which affects how fast the color blend is rendered.
With fast render on, edit mode will just let you refresh tiles briefly by clicking them. With fast render off, you can actually disable a tile, thus preventing it from rendering. Click a disabled tile to re-enable it. Dunno why I made that, probably just to experiment around.
Thank you to everyone who viewed this! Over 38,000 views!! I never expected to be part of the 0.001% of Scratchers who get featured.
You guys are awesome!