I want to add a simple leaderboard to my games. All Time High Score and Monthly High Score.
I need to know the following:
1. How much does enrollment cost?
2. What are the limitations to use or number of people allowed on the leaderboard?
3. How easy is it to implement?
4. Is it cross platform? Like can I put it in a version I put on facebook and different phone types and even the computer versions?