@shadowman
There's a great difference in difficulty between the "Japanese Language" and the "Japanese Writing System". Japanese is, regarding grammar and regularity, one of the easiest languages that I am aware of. Whereas the writing system (i.e. Kanji; Kana are no more difficult than western alphabets) is pretty much an inconsistent pile of random strokes. Well, not exactly that bad, but inconsistent nonetheless.
What I am trying to say: "Just learn Kanji" is a bad advice to someone, who does not intend to spend months or years into learning how to read and write a language, just in order to play a porn game.
@Ztron5
Where did you read that? As of right now, he tries to find other solutions regarding the illegal downloading of his games. Actually, the idea of putting Japanese questions in the game, so non-Japanese could not play, was a rather random idea anyway. It was slightly exaggerated in this forum, especially since most people did not even read his blog.
And while I'm not exactly sure whether or not he has a problem with foreigners, his concern is primarly about the illegal downloading and thus the missed profits (plus the fact that it's unfair for those, who actually buy his games). Plus, if his games are uploaded on foreign websites, Japanese people download them illegally, too. Still, back in March, some people here even called him a racist. I mean, what the hell?