Logic Masters Deutschland e.V.

Rules
Draw a connected network passing through the centers of some cells of the main grid. The network may branch turn and loop, but may not contain any dead ends.
The main grid is divided by thick edges into regions. For each region, the network crosses its boundary in exactly two points. A number placed in a region gives the number of cells in that region occupied by the network. Two adjacent cells separated by a region boundary cannot both be unused by the network.
A clue outside the grid indicates how many times the corresponding line shape (i.e. cross, branch, straight line or turn) appears in the corresponding row/column, irrespective of rotation.

Here is a small example to illustrate the rules. You can try solving the example online in Penpa+ or Sudokupad.

Solve the main puzzle online:
Penpa+
Sudokupad