Logo is another great contestant for the goal. You're going to have a hard time with it unless you want to draw polygons. Of course, in C++ you have a hard time with everything, so it's hard to say. I'd have to vote for Klik & Play, though. Even if you can improvise a Turing complete system in it, everything is still hideously hard, as system bugs and limitations just fall over every path you find. Since all KNP can do without a great deal of hacking and slashing is a Breakout game, it's probably the most specific language ever.