From the gurzil zometool wiki

Main: Cryptocubes

• Cryptocube 2015-12 December, class... 11?
• Cryptocube 2015-11 November, class 5.
• Cryptocube 2015-10 October, class 9.
• Cryptocube 2015-09 Setember, no class
• Cryptocube 2015-08 August, a class 3
• Cryptocube 2015-07 July, a class 2.
• Cryptocube 2015-06? Too many birthdays...
• Cryptocube 2015-05 May, a class 8.
• Cryptocube 2015-04 April, a class 1.
• Cryptocube 2015-03 March, a class 7, all struts.
• Cryptocube 2015-02 February, a class 6, all struts.
• Cryptocube 2015-01 January, a class 4, all struts.
• Cryptocube 2014-12 December, a class 10.