Talk:Infinite~ Challenge (event)/@comment-171.5.235.19-20150401121303/@comment-26044650-20150401155505

4 is an unlucky number in China/Japan as it reminds them of death, so it would make sense for them to skip the 4M (or anything that has a 4 in it) tier. However, 13 is considered unlucky in the US.

Maybe they changed it around so it would make more sense in the US by adding in the 4M (or anything with a 4 in it) tiers back in but removing the 13M tiers.