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This is likely because the variable has not been defined within the game contract, or it is not being accessed correctly within the code.

To fix this issue, make sure that the variable has been declared and initialized properly within the game contract. Additionally, ensure that any functions or code that are meant to access the variable are correctly referencing it, using the correct syntax to call and manipulate its value.

If the issue persists, consider seeking further assistance or consulting Solidity documentation for more information on argument-dependent lookup in Solidity programming.