I would like to make an Android app which replicates a puzzle board game played as a small side feature within a popular action video game.
- Am I allowed to create such an Android game with the same rules as the original game and publish it to the Google Play Store?
- If so, am I allowed to use the same texture graphics from the original game?
- I plan on making this app free to download anyway. However I'm curious, is it necessary to make it free to avoid copyright infringements? But what if the app has in-game ads which generate income?