Slitherbahn
Rules:
Draw a totally connected loop network through the centers of some cells, which may branch or turn, but may not have any dead ends. A clue outside the grid indicates how many times the corresponding line shape (i.e. a cross, branch, straight line, or turn) appears in the corresponding row or column, irrespective of the line shape’s rotation.
A number on a vertex indicates how many of the four surrounding edges to that vertex are crossed by the loop network.