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Paint labright wall · nothing is saved
The can
Presets
Flare: with a pen, tilt it to tilt the can (the line opens into mist on one side)
Experiments
Keys & mouse

Left paint · right drag look · WASD walk
Wheel size · Shift straight line · 1–7 colours
Ctrl smooth curves · Flick: let go right after a quick move
0 eraser · Ctrl+Z undo
C next preset · pen tilt flare