The Dink Network

This is why you want a giant invisible sprite.

In looking at this video, It looks dink is the active sprite when there is not a reticle on the screen, then dink loses focus while the mouse cursor (drawn as a reticle) is active on the screen. His idle anim is still going on, but it looks slower to me for some reason...perhaps paralax is to blame for that

With this in mind, I would expect the sprite need only be the size of the mouse cursor. In on_click(), you could simply populate &Retx = sp_x(&current_sprite, -1) and &Rety = sp_y(&current_sprite, -1). This would mark where on the screen to drop the rocks. After completing, you could disable and hide the reticle sprite and yield focus back to dink.

Steps 2 & 3 look useful in, mouse_mode_tutorial-1_01