Guide the pen with your mouse. Press S or space to stop or start. You can also click the Start/Stop button. For mobile, just click the stage. Press T to change the theme.
It might be a bit laggy in mobile mode. You might need to double click the green flag if it's laggy. Updates: 28 / 3 / 2026 - Release (V1.0) 30 / 3 / 2026 - Made curves more varying (V1.1) 19 / 4 / 2026 - Added light theme (V1.2)
