APSudoku: take over maintaining hintgame sudoku from bk_sudoku (#3432)

worlds/apsudoku/docs/en_Sudoku.md

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+# APSudoku
+
+## Hint Games
+
+HintGames do not need to be added at the start of a seed, and do not create a 'slot'- instead, you connect the HintGame client to a different game's slot. By playing a HintGame, you can earn hints for the connected slot.
+
+## What is this game?
+
+Play Sudoku puzzles of varying difficulties, earning a hint for each puzzle correctly solved. Harder puzzles are more likely to grant a hint towards a Progression item, though otherwise what hint is granted is random.
+
+## Where is the options page?
+
+There is no options page; this game cannot be used in your .yamls. Instead, the client can connect to any slot in a multiworld.

worlds/apsudoku/docs/setup_en.md

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+# APSudoku Setup Guide
+
+## Required Software
+- [APSudoku](https://github.com/EmilyV99/APSudoku)
+- Windows (most tested on Win10)
+- Other platforms might be able to build from source themselves; and may be included in the future.
+
+## General Concept
+
+This is a HintGame client, which can connect to any multiworld slot, allowing you to play Sudoku to unlock random hints for that slot's locations.
+
+Does not need to be added at the start of a seed, as it does not create any slots of its own, nor does it have any YAML files.
+
+## Installation Procedures
+
+Go to the latest release from the [APSudoku Releases page](https://github.com/EmilyV99/APSudoku/releases). Download and extract the `APSudoku.zip` file.
+
+## Joining a MultiWorld Game
+
+1. Run APSudoku.exe
+2. Under the 'Archipelago' tab at the top-right:
+	- Enter the server url & port number
+	- Enter the name of the slot you wish to connect to
+	- Enter the room password (optional)
+	- Select DeathLink related settings (optional)
+	- Press connect
+3. Go back to the 'Sudoku' tab
+	- Click the various '?' buttons for information on how to play / control
+4. Choose puzzle difficulty
+5. Try to solve the Sudoku. Click 'Check' when done.
+
+## DeathLink Support
+
+If 'DeathLink' is enabled when you click 'Connect':
+- Lose a life if you check an incorrect puzzle (not an _incomplete_ puzzle- if any cells are empty, you get off with a warning), or quit a puzzle without solving it (including disconnecting).
+- Life count customizable (default 0). Dying with 0 lives left kills linked players AND resets your puzzle.
+- On receiving a DeathLink from another player, your puzzle resets.