I'm so glad I was on this site the day that Ninjhax was announced. I ran to my used game store, to my surprise someone was in line right ahead of me, picking up Cubic Ninja, I was truly surprised to run into someone else on that day realizing how important it was to get that game. Didn't matter though, I asked if they had another copy,they did, cost me $4. I even briefly chatted with the guy getting his copy about how excited I was for the SNES emulator that was already available. At the prices I see online now, it's outrageous. I'd sell my copy of Cubic Ninja as I rarely need it anymore, but every once in a while I'll need to debug or alter something in the sysNAND, so sadly, as much as I'd like to help others out, I really can't depart with my copy at this time.
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Never really thought about this but the US Cubic Ninja has a really nice label, especially for such a bad game. The JP one pretty nice too.
Got my first 2 US ones for $5/$15 and the JP one for $30.
Cubic Ninja isn't a bad game at all. It's simple, and certainly not loaded with a ton of content, but it is a charming and enjoyable game for what it is.