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Idea by PotatoImaginator!
Open in two separate windows and press A to sync the movement in two windows together.
If you have a TIC-80 version with fft(), you just need to press A on one window. Otherwise, tstamp() is used, and you have to press A on every window quickly.
Use the arrow keys to change the camera view so you can see the balls moving from two different views. :)
By default the playing field is two screens wide, one screen tall. You can change the screen_x and screen_y values in code for a different size.
You can also change the w_bezel and h_bezel values to account for the black borders between windows (default sizes 0 and 0).