it's still in the top 50 global best sellers on the newest chart so we would have to wait for quite a while. We'll never know if it's the worst selling because some of those have only japan sales and some we have no sales at all. I know for example though that kirby's block ball is pretty common in the US. Kirby's Dream Land 3 i remember being released super late in the SNES life and it is very rare outside of Japan. It's selling for 85$ on amazon US.
currently playing: Skyward Sword, Mario Sunshine, Xenoblade Chronicles X