Logic Masters Deutschland e.V.

Here's another doppelgänger somedoku, combining rulesets originally created by Kafkapharnaum and blackjackfritz respectively.

Rules:

DOPPELGÄNGER SOMEDOKU:

The puzzle consists of a 10 by 10 grid missing the R10C10 cell.

For n between 1 and 9, row n contains exactly one 0 and n distinct digits from 1-9, repeating digits as necessary.

For n between 1 and 9, column n contains exactly one 0 and n distinct digits from 1-9, repeating digits as necessary.

Row 10 consists of a complete set of the digits 1-9. Column 10 consists of a complete set of the digits 1-9.

For each 0 in the puzzle, the digit in row 10 of its column is different from the digit in column 10 of its row.

SINGLE-INDEX CIRCLES:

All cells except those in column 10 and those in row 10 are part of what is called the "main grid."

A digit x in the main grid appears in a circle if and only if the digit has exactly one of the following properties:

1. It is in column x.
2. It is in row x.
3. Within the main grid, it appears exactly x times in its column.
4. Within the main grid, it appears exactly x times in its row.

Digits outside the main grid are never circled.

All possible circles are given.

MULTI-INDEX DIAMONDS:

A digit in the main grid that appears in a diamond must fulfill at least two of the four properties listed above. Not all possible diamonds are necessarily given.

EVEN/ODD:

A digit in a shaded grey cell must be even.

Play the puzzle on SudokuPad.