build a multiplayer game app android and ios

We need an application game developed for android and ios and eventually for pc and mac. here some characteristics: multiplayer online is a quiz game competition very similar to " quiz panic" ( made from [login to view URL] we need to change avatars and some rules. the game will be composed of 4 turns (Eighth finals, quarter finals, semifinals and the final) 1 turn starts when 20 players will be in the same room and like you can see in the quiz panic, based on the correct answers and The time it took for to give the correct answers, Will generate a ranking, so who will be the first classified will go forward to the 2 turn. the 2 turn will be also composed from 20 players that won the first turn. and in the same way the players can go forward to the 3 turn and 4 turn. in conclusion, will partecipate to the 4 turn (final) 20 players that won in a row 1, 2 and 3 turn. _______________ the avatars have to be animals and the players can develop their avatar that can grow up from caterpillar till dragon. This will depend on the number of matches that they have played and the number of exact answers that they have guessed. after downloaded the app , for to play, need to make a registration and phone number confirmation (whatsapp style) and security password. for each user created need to have connected a bitcoin wallet because the game is pay to play.