Logic Masters Deutschland e.V.

I hope you will enjoy my third puzzle! I am very proud of it :-)
I would be really grateful for all the comments and ratings.

Normal sudoku rules apply.

Killer: Digits in a cage may not repeat.

Sandwich: A clue outside the grid gives the sum of the digits appearing between the 1 and the 9 in that row/column.

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Prison: Cages represent prisons. One full cage is one prison.

Police: Digits 1 and 9 are cops - they cannot go to the prison (i.e., digits 1 and 9 cannot appear in cages).

Criminal group: Digits 4, 5 and 6 are robbers. The number of robbers in the prison(s) in the box equals the power of the police in that box.

Unlucky fellows: Digits 8 are victims of judicial system - wrongfully convicted for crimes they didn't commit. Luckily, most of them have been already released from the prison (i.e., there are more digits 8 outside the cages than inside the cages).

Civilians: Digits 2, 3 and 7 are law-abiding citizens - they might appear in the prison, but only as visitors.

Cop power: The power of a single cop equlas the number of cops he stands shoulder to shoulder with (i.e., sees by a chess king's move).

Which cops are better: Overall in the grid the power of digits 1 equals the power of digits 9, however digits 1 have less cops with no power than digits 9.

Police power: The power of the police in the box is a sum of powers of cops in that box.

Prisoners: If a digit 4, 5, 6 or 8 appears in the prison, it is considered a prisoner.

Visitors: If a digit 2, 3 or 7 appears in the prison, it is considered a visitor.

The number of visitors cannot be greater than the number of prisoners within a single prison, with one exception (i.e., there is only one prison where the number of visitors is greater than the number of prisoners).

The sum of digits of all visitors in all prisons where the number of prisoners equals the number of visitors is 15.

Additionally, each prison with the number of prisoners equal to the number of visitors has the same sum of digits as one another prison in the grid.

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Below is the example to help you understand the cop power and the police power principles:
- Little red number in the top-left corner of digits 1 and 9 represents their cop power.
- Little blue number in the bottom-right of the box represents a police power in that box.
- The number of robbers in the prison in the box equals the police power in that box.

SudokuPad Link

If you liked this puzzle, I recommend trying out my other puzzles:
Symmetrical Fan
Night Club
Broken Flashlight in the Darkness
Blown Fuses in Electrical Installation