# RED SUS

#### Fillomino

Rules

- Divide the grid into regions.
- If two regions are
**adjacent**, they do not have the same size. - A given number in a region indicates the size of the region.
- A region may contain any number of givens, including zero.

*Extraction: extract all letters adjacent to exactly 3 borders.*

#### Hashiwokakero

Rules

Draw bridges between islands (numbers in circles) such that:

- Bridges start and end on distinct islands.
- Bridges are either horizontal or vertical.
- Bridges may not cross other bridges or islands.
- If there exist bridges between 2 islands, there are
**either one or two**bridges between them. - The number on the island indicate the number of bridges connected to it.
- All islands are connected via bridges (i.e. you can travel from any island to any other island via bridges).

*Extraction: extract all letters part of an odd number of bridges.*

#### Heteromino

Rules

- Divide the white cells along the dotted lines into regions of size 3.
- Regions of the same shape and the
**same**orientation are not orthogonally adjacent.

*Extraction: extract all letters in the middle of polyominoes.*

#### Icebarn

Rules

- Draw a directed path from IN to OUT via axis parallel lines connecting centers of cells (and the IN/OUT arrow).
- The directed path must pass through the arrows in the indicated direction.
- The directed path must pass through every icebarn at least once (An icebarn is a connected region of ice cells).
- The directed path may not turn on ice cells.
- The directed path may cross only on
**ice**cells. - When the path is crossing, the path must go straight.

*Extraction: extract all letters on where the path makes a turn.*

#### LITS

Rules

- Shade 4 cells within each region to form a tetromino (4 connected cells).
**Same**tetrominos may not be adjacent (2 tetrominos are the same if you can reflect and/or rotate one to form the other).- All
**shaded**cells must form a connected region. - There may not be any 2x2 region of
**shaded**cells.

*Extraction: extract all letters on unshaded cells.*

#### Masyu

Rules

- Draw a single non-intersecting loop connecting centers of cells via
**axis-parallel**lines. - The loop may only turn at center of cells.
- The loop must pass through the center of every circle.
- The loop must go straight through every white circle and make at least one turn before going a distance of 2 either before or after the white circle (or both).
- The loop must turn in every black circle and go straight for at least a distance of 2 before and after the black circle.
- The loop may enter and exit each cell at most once.

*Extraction: extract all letters on where the loop makes a turn.*

#### Moon or Sun

Rules

- Draw a single non-intersecting loop connecting centers of cells via axis-parallel lines.
- A region of bolded lines is called a "room". The loop goes through each room
**exactly once**. - Whenever the loop visits a room, it must pass through either all of the suns and none of the moons or all of the moons and none of the suns in that room before leaving the room.
- The loop must visit every room at least once.
- The loop alternates between "visit all suns" and "visit all moons" whenever it enters a room.

*Extraction: extract all letters on the loop during the visit to all suns (circles) in the region.*

#### Nurikabe

Rules

Shade some cells such that:

- Number cells remain unshaded.
- A number indicates the amount of connected unshaded cells in the unshaded region the number is in.
- Each unshaded region contains
**exactly one**number. - All shaded cells are connected.
- There may not be a 2x2 region of shaded cells.

*Extraction: extract all letters on unshaded cells.*

#### Star Battle

Rules

Place some stars such that:

- Each row and column contains
**exactly 2**stars. - Each outlined region contains exactly 2 stars.
- Stars may not touch (2 stars are touching if the 2 cells containing them share at least a point).

*Extraction: extract all letters on stars.*

#### Sudoku

Rules

Place numbers such that:

- Every row and column contains each number 1-9
**exactly once**. - Every outlined 3x3 box contains each number 1-9 exactly once.

*Extraction: extract all letters on even numbers.*