The puzzle is not fun. There are use only power of GPU not power your Brain.
If you want fun, play video games. This is a serious thing. A security testing, increasingly hard, mind boggling, enthusiastically coding, mathematically challenging and most of all: very lucrative job. If you're a puss, you'll be run down by it.
Come down friend. There are not mathematically is just Random. I try many theory mathematics and found some rule of puzzle. There are never complete.
If you like lottery of bitcoin. Try your luck.