Additional:

I ran several online scans concerning the website "subagames(dot)com and found very few flags.
https://www.virustotal.com/en/url/ac133e7ea746d3f40c20e024cab560d26cc58b856b68693b8736fb7769f60e1b/analysis/1407940987/
http://sitecheck.sucuri.net/results/subagames.com
http://quttera.com/detailed_report/subagames.com
http://zulu.zscaler.com/submission/show/52b5954b92ee46ab24b642c130cb8205-1407941401
https://asafaweb.com/Scan?Url=subagames.com

I ran more checks than these with each one showing the website is clean.
There may be something in the actual game which avast flags.