The 'buy'-Menu in Ghost World 3D. Here for example with the 'article' Enemy (Ghost) Scanner Update.
In the Game you don't only collect Ammo, Life's and so forth, you can 'buy' them too (with your in the game collected & earned Money). You can get there Updates too (3 for the Ghost-Scanner & 4 for the Mini-Map). Here you see the 1. of 3 Ghost-Scanner Updates in the 'buy'-Menu.
When you buy this update, it activates the Ghost-Scanner, that will be green, when a Ghost is near. The Ghost-Scanner ist the Color around the Compass, that only appear,when a Ghost is near.
It helps you for example for warn yourself about Ghost(s) in the near (you can then better flee or plan or react 'faster'). There are 3 more Ghost-Scanner Updates available (yellow and red),
that warn for other Ghost-distances.