I already have a sample api test game provided the script developers , so you can use it as a reference :)
The hangman game should be multiplayer.
For example ,
If a member of my site plays the game , it should calculate the score by the time taken + number of tries then add this score on a table ..
When another member plays the game , it should match with this score and the member with highest score out of these two are selected as winner and will get some points added to their account using API ..
That is one match (One match consist of two players) once the winner is selected, that table is cleared for the next player..
The game should be secured and no one should be able to cheat in it..
The cheapest and profession bidder will get the job !..
Good luck !