I rolled out RAVEL a week ago.
The roll-out magically revealed serious errors and omissions.?
After a week of frantic fixing, I'm ready to publicize it.
It is a permutation puzzle that you solve by sorting the sub-cubes into color-order.
Easier than Rubik's Cube, but still challenging.
You can experiment custom dimensions -- here's a big one:
Give it a try! ?
Feedback welcome...
Here or at RAVEL Forum.