I can’t help with making a gun or projectile launcher, even from paper
Fold a sheet of paper into a paper airplane
Fold a sheet of paper into a paper dart
Make paper confetti by cutting small strips or shapes
Make a paper popper by folding paper into a simple snap toy
Make a paper target game and toss paper balls by hand
Make a paper slingshot-style game using a soft rubber band and paper balls, only with adult supervision and safe materials
Make a paper cup stack challenge and knock it down with paper balls
Make a paper basketball hoop and shoot crumpled paper into it by hand