Game contract features implementation

[alilloig]

Issue To Be Solved

Implement the features designed in the Game contract proposal

(Optional): Suggest A Solution

(Replace This Text: A concise description of your preferred solution. Things to address include:

• Details of the technical implementation
• Tradeoffs made in design decisions
• Caveats and considerations for the future

If there are multiple solutions, please present each one separately. Save comparisons for the very end.)

(Optional): Context

<what are you currently working on that this is blocking?>