Use the following commands while using the Select tool.
EFFECT - COMMAND Nudge one pixel - Select an area, then hold L and press the D-pad to nudge the selection by one pixel in that direction. Note: You can also use the touchscreen to drag your selection. Rectangular selection - Hold Start + Select while touching the screen. Invert - Select an area, then hold L and press X to fill all empty pixels and empty all filled pixels. Stamp - Select an area, then hold L and press A to stamp your selection on screen. Paint fill - Select an area, then blow into the microphone. Quick erase - Select an area, then press X. Note: To delete everything, press X without the Select tool.