Summary of controls and interface for the confused:<p>Paint on the gray grid to toggle the existence of pixels. You put your mouse where the top face of the pixel goes. Change the color of the pixel to paint by selecting a color from the bottom-right.<p>Move the gray grid up or down to edit a different layer/level. Pixels above the grid are hidden. To move the grid, drag the slider at the left, click its arrow buttons, or use the mouse wheel.<p>You can rotate the camera by dragging anywhere in the canvas except for the gray grid.