You may have seen this thread
If you want a nice solving challenge you can choose between
- easy = Mercury or Jupiter
- hard = Saturn (in my opinion); maybe Earth and Mars are not far away
A reduction method is nice. You can apply one to any planet.
(The early method was "Circle Corners Last".)
It seems that we have two non-overlapping sets of twisty puzzlers regarding the Crazy planets
- either they love some
- or they hate them
If you get Mercury +
Jupiter you can make all
planets AND a standard circle cube (which is no other challenge than a pretty hard turning 3x3x3 Super Cube).
BTW, the Witeden 3x3x3 with two circles is not called a Crazy Cube but Super 3x3x3. At least here