Also known as:
Enigma is another logical, picture-forming Conceptis puzzle. According to Conceptis, the puzzle was developed originally in Japan and first published by Byakuya Shobo under the name Number Net.
There are colour and mono versions, although generally speaking, the mono versions make for better puzzles. A peculiarity of the puzzle is that in the early stages, it doesn't present much of a challenge: the 1s and 2s can be completed without any problems, and the puzzle doesn't present much in the way of difficulty until the bigger numbers are reached.