| Section       | Size (bytes)  | Note                                        |
|---------------|---------------|---------------------------------------------|
| Header        | 11            | 'tilemap_1.0'                               |
| Columns       | 2             | 65536 max                                   |
| Rows          | 2             | 65536 max                                   |
| Data          | variable      | 2 bytes per tile (index, flags)             |