[SmartAlx]

I'm pretty sure this stuff is copyrighted. Have you thought of contacting the game manufacturer?

1) They will certainly be able to provide the sound files.
2) They might want some of the profit, but doing so will authorize your app. I'm sure adding $1 to the cost of the app would more than cover their share and you might get some help from them since they are now your partner and they have a vested interest in seeing your app succeed.
3) If they do authorize the app, you can be rest assured that the app won't get pulled like the tris app did.
4) Be careful about maintaining creative control of the app if you do go into an agreement with them.
5) Get everything in writing.