Well, unfortunately this threshold is not by us to decide. It is by Nintendo. But lets say that 100 levels are made with mario, and that each has 100 hits. Those are 100000 hits.
But the problem starts when search engines start to give this priority, something that will happen eventually, especially when demand gets higher due to more levels featuring Mario.
Basically, if I say yes to this, everyone will think its okay and don't even ask. My job is to point out the risks, even if they are little.
So is it safe? This one instance if done properly, yeah, probably. But am I 100% sure of that? No. Can I be? No. I am not the CEO of Nintendo.