Puzzle #200: Quartet

This is a quartet puzzle of Maximal Archipelago, Yajisan-Kazusan, Heyawake, and Smullyanic Dynasty.

The rules for Maximal Archipelago can be found here: Rules page

The rules for Yajisan-Kazusan can be found here: Rules page

The rules for Heyawake can be found here: Rules page

The rules for Smullyanic Dynasty can be found here: Rules page

In this puzzle, the grid is divided into four sections. Maximal Archipelago in the top left, Yajisan-Kazusan in the top right, Heyawake in the bottom left, and Smullyanic Dynasty in the bottom right. Together they form a large grid, and all connectivity and adjacency rules apply across the whole. In addition, each number has been replaced by a letter. Different letters refer to different numbers, with the same cipher being used throughout the whole puzzle.

Clues in the Maximal Archipelago only refer to squares in that corner. The maximality constraint also only applies to that corner, meaning that in the final solution of the puzzle, it should not be possible to add a black square to the Maximal Archipelago without breaking connectivity or adjacency.

In the Heyawake, only the borders within the grid matter for the border rule. The borders between the four grids are not used for the Heyawake constraint.

In the Smullyanic Dynasty, clues look at the squares in adjacent grids.

Happy 200th puzzle at last!