source: https://www.securityfocus.com/bid/25790/info

The 'bcoos' Arcade module is prone to an SQL-injection vulnerability because it fails to adequately sanitize user-supplied input before using it in an SQL query.

A successful exploit may allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.

This issue affects bcoos Arcade module 1.0.10; other versions may also be affected. 

http://www.example.com/modules/arcade/index.php?act=play_game&gid=[SQL]