p.s. the "mystery prize" (or prize(s)?) will only be revealed to those who manage to reach that tier [which should be quite doable for those who e.g. work in larger companies -- just get your colleagues to sign up to the Chart Of The Week, or e.g. those who are active on social media -- just make a post or direct message your buddies.
p.s. the "mystery prize" (or prize(s)?) will only be revealed to those who manage to reach that tier [which should be quite doable for those who e.g. work in larger companies -- just get your colleagues to sign up to the Chart Of The Week, or e.g. those who are active on social media -- just make a post or direct message your buddies.