I just installed PICO-8 on my Mac, and I'm not sure how to right click. When I try, the result is the same as a left click. I've tried holding down Ctrl, Option, Cmd, Shift, but none of those works. Is there a system setting I need to change somewhere?

Do you have right click working in other apps but not pico8?

Launch System Preferences from the Apple menu or by clicking it in the Dock.
Click on the Mouse pane.
Click on the Point & Click tab.
Check the box next to Secondary click.
Choose ‘Click on the right side’ to enable right-click on a Mac mouse.
i got this form google so it might not work

Thanks for your responses. My mouse is part of a Wacom graphics tablet, for what it's worth. It works fine everywhere else; I simply right click.

@papa_shrim I believe that page is just to set left vs. right (e.g., to allow left-handed users to make the RMB the primary click).

On my trackpad, I normally double-tap or Ctrl+tap to make a right click. Again, this works fine everywhere else. In PICO-8, it doesn't emulate a right click.

For example, in the sound editor, here's what happens if I click/tap on SPD:

LMB:        +1
Ctrl+LMB:   +4
Option+LMB: +1
Cmd+LMB:    +4
Shift+LMB:  +4

RMB: same as LMB in all the above combinations

tap: same as LMB in all the above combinations
double-tap: +4 (regardless of keyboard)

In other words, there doesn't seem to be anything I can do to give -1 to SPD (which I believe is what would normally happen?).