User blog comment:HMcCoy/Finished many things!/@comment-24808864-20150308212031/@comment-24808864-20150310220411

Found them (hopefully):

Two were among the four "Hidden" exercise on the Geometry Math Mission that we discovered last November.

The last was an exercise that was removed from math mission but is still remaining in the world of math.

3/10/2015-15:04PST-Done