We have an idea of developing the card-based game that user can login with email and social account.
User can create his profile in the game and upgrade his own profile.
There are 3 ways to play game such as single mode, online mode and tournament mode.
Once user win a victory, 50 coins per game will be awarded to him.
If he has much scores and coins, he can play with high level room.
More details will be shared with right candidate.
If you have experience in game development, send me your proposal in detail