Its a 4x4x4 but you can put the date on it!
Introducing the Ziina Star 4x4 Calendar cube! This is a simple 4x4 speedcube that turns similarly well to the MeiLong 4x4 which is about the best it gets in terms of non-magnetic budget 4x4s, the difference is with this though, is that it doesn't have normal colours. The Ziina Star 4x4 calendar cube has various numbers and letters throughout the pieces that allow you to make today's date (and tomorrows and so on...), you can challenge yourself every morning to make the new date. You can buy it here
