Level
The number of regular levels is located at $9F:8000. This count includes level 0 and the credit level, but not any of the bonus levels. The level data pointers are located at $9F:8002. In a regular ROM, these are 16-bit pointers relative to bank $9F. In a Necrofy built ROM, these are 24-bit pointers padded to 4 bytes each.
Level data structure
Header
| Offset | Length | Type | Description |
|---|---|---|---|
| 0x00 | 4 | pointer24 | Pointer to the tileset tilemap |
| 0x04 | 4 | pointer24 | Pointer to the level background data |
| 0x08 | 4 | pointer24 | Pointer to the tileset collision data |
| 0x0C | 4 | pointer24 | Pointer to the tileset graphics |
| 0x10 | 4 | pointer24 | Pointer to the tileset palette |
| 0x14 | 4 | pointer24 | Pointer to the sprite palette |
| 0x18 | 4 | pointer24 | Pointer to the palette animation entity |
| 0x1C | 2 | pointer16 | Pointer to the respawning monster data |
| 0x1E | 2 | pointer16 | Pointer to the victim and one-shot monster data |
| 0x20 | 2 | pointer16 | Pointer to the item pickup data |
| 0x22 | 2 | uint16 | Level background width |
| 0x24 | 2 | uint16 | Level background height |
| 0x26 | 2 | uint16 | Priority tile count |
| 0x28 | 2 | uint16 | Visible tiles end |
| 0x2A | 2 | int16 | Player 1 start X position |
| 0x2C | 2 | int16 | Player 1 start Y position |
| 0x2E | 2 | int16 | Player 2 start X position |
| 0x30 | 2 | int16 | Player 2 start Y position |
| 0x32 | 2 | uint16 | Music ID |
| 0x34 | 2 | uint16 | Extra sounds ID |
| 0x36 | 2 | pointer16 | Pointer to the first level title page |
| 0x38 | 2 | pointer16 | Pointer to the second level title page |
| 0x3A | 2 | optional pointer16 | Pointer to the bonus data |
| 0x3C | 2 | pointer16 | Necrofy ROMs only. Pointer to the secret item bonus subroutine |
| 0x3E | 2 | uint16 | Necrofy ROMs only. Bonus level number |
Immediately following the header is the boss monster data