Build a stock market game

Stock Market Game Rules: 1 All registered members on my website can can take part in game 2 Players have to choose Indian Stocks from a predefined list of 500 stocks 3 Two games would be there one weekly game and one monthly [login to view URL] will be declared at end of Week for weekly game and end of month for monthly game Weekly game will run from Monday to Friday. Registeration will close by Sunday (12am) Monthly game will start from 1st trading day of month to last trading day of month 4 Players can choose 3 stocks of their choice for weekly game and 5 stocks of their choice for monthly game 5 Players cannot change stocks once decided 6 Players are allowed to short stocks ie sell stocks instead of buy 7 Winner will be the person whose %gain will be highest based on 3 stocks for weekly game and 5 stocks for monthly game 8 Leaderboard (Top 10 )should be displayed at end of every day based on closing price of the stock 9 More than 50 members are not allowed to regsiter for weekly or monthly game and less than 5 members for weekly or monthly game 10 Each player has to pay Rs 100 for weekly game through paytm link in website 11 Each player has to pay 300 for monthly game 12 if more than 50 members want to play,51st member should be placed in parrallel weekly game 2 and so on 13 Game should not start if members regsitered are less than 5 14 Winners name should be stored and displayed like how many times he has won comepetion 15 Winners 1st,second and third spot would be declared and paid out 40%,25%,20% of total proceeds. For example if total members are regsitered 20 with deposit of rs100 each for weekly game. Winner will be paid 800 secon spot 500 and third spot 400