Drag across the paper and the water spreads, carrying the pigment with it. Lay a color beside another while the paper is wet and the two bleed together; wait for it to dry and the next color glazes over the one below. Pigment gathers where the water recedes, so the edges darken on their own.
The tool panel switches between the brush, the water brush, the eraser, and the picker. More water bleeds further, more pigment stays darker. The water brush lays down water alone, so it softens color that is still wet and lifts color that has dried. The size also moves with [ and ].
Pick one color from the paint box in the color panel, and press the last one for any color you like. The layer panel stacks sheets: press a row to paint on it, and press the dot to hide it. Wet paint dries before you move to another layer.
The edit panel holds undo, redo, dry, clear all, and save image. Dry pulls the water out without waiting, so you can glaze the next color straight away. Save project writes a JSON file, and opening it puts you back where you left off.
Every panel is movable. Drag a panel by its header and it snaps to the other panels and to the edges of the screen. Grab an edge to resize it. Double-click the title to switch how the panels are laid out; the fixed layout puts a single panel in the top right.