This was supposed to be in the Plants VS Zombies thread, but I guess it fits here better.
So, guess what. The Russian pirateers decided to sell the whole thing not just a demoversion, but as a game with a complete level set! Not sure where did the source code go, but I guess it went void with the zhengyaxin_8bit's site. Chinese free site hostings are shit, me tells ya.
Proof, with some additional proof on that it IS Zheng's game and on ridiculous prices of the cartridge anywhere outside Russia, all brought to you by The Greedy Gamer. In the language most of you don't know, of course.