put a lead capture on it and send the cheat as an autoresponder
That way every week or however long you can email them either the latest games (through amazon affiliates) or some clickbank cheat program etc.
400 uniques is good enough to make around $200-300 per week profit on - and the good thing with lead capture - its very scaleable as week 1 you have 30 signups, week 2 you have 60 and so on
since its just a copy and paste cheat codes, i think it should be easy for u to SCALE up and make 100 more sites. if u can make 1 dollar with one site in a day, that means u can make $100 with 100 sites in a day. the sky is the limit.
You can also add like tutorials and other tips n secrets ( including CPA )