Mobile Fullscreen Scratch
Consists of:
- a foreground image (.png, .jpg, .gif), size 320x480 px,
- a background image (.png, .jpg, .gif), size 320x480 px.
Instructions:
- The foreground image should somehow indicate, that the ad should be "scratched".
- The images should be different enough, that the user gets an immediate feedback when "scratching" over the ad.
