A gaming promotion poster featuring a metro/subway themed background with futuristic cyberpunk elements. The background should blend elements from urban metro environment with dynamic lighting effects. The poster displays reward tier information in Chinese: 

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本图为通过千图AI社区智能设计工具自动生成的「A gaming promotion poster」图片。图片由AI根据用户输入智能构图，支持一键生成高质量原创视觉内容，助力个人创作者与商家高效输出营销素材。欢迎使用！

https://preview.qiantucdn.com/workflow/ww/fe/N3/XO5m661a7usXxbvWSlxegczgEblUPKRSq9_PIC2018.png!w1024_new_small_ai_2