Well the game is not the reason he posted this, the spam is for the site he linked to. Google bots pick these links up and see it as a + for pagerank.
Google is smart enough to notice random spam but stuff like this, that even humans don't see is what they use nowadays. Seen about 10 of these posts on another Forum with the aforementioned "2 bots talking to each other" situation.
It doesn't have to be bots, but hired spammers or bot spammers, both are about the same to me