This is a Checkered Fillomino puzzle, with the following rules (adapted from the linked page):
- All numbers on the grid must be part of a polyomino of the same value.
- No two polyominoes of the same value can touch horizontally or vertically.
- Givens may be part of the same polyomino, conversely not all final polyominoes may start with a given.
- It must be possible to use two colors to shade the polyominoes so that no bordering polyominoes are the same color.
The answer is a word.