Trying
Point_Search_RC So, for puzzle 135 it would be;

134
135
25
02145d2611c823a396ef6712ce0f712f09b9b4f3135e3e0aa3230fb9b6d08d1e16
and it goes forwards and backwards?
Just a concept code. Not worth trying for puzzle #135. CPU version can be improved in many ways(partitioninf the space according no number of CPU cores set to use). Best choice GPU code with search space partitioning to an array of GPUs.