You have chosen to sponsor your bid up to a maximum amount of .
similar to the app below, but with UI redesign and some function modification. this doesn't have any patent infringment issue, as bingo is a popular game.
major function change required:
-all bingo caller voice not needed
-refer to （http://a5.mzstatic.com/us/r1000/106/Purple/v4/c8/7a/a2/c87aa22c-8f24-637f-c086-2752c0542570/mzl.aersanem.320x480-75.jpg ）, the text next to every bingo number should be changed to 'grey' text prize (grey means if the price related to the number is not specified, then the prize is none). and add a edit button to the upper left corner, to allow user to edit the text associate to each number
-refer to (http://a2.mzstatic.com/us/r1000/085/Purple/v4/db/a3/81/dba38105-c515-af9e-3f5d-1e98809f810a/mzl.brhzmmhh.320x480-75.jpg ),every time when the bingo number is changed, the prize associate to that number should be shown below the number.
the final source code ownership should be mine.