A number of custom blocks have been inserted into the baserom with GPS, they are as follows. You can see how they are laid out in Map16 on this page.
When adding your own blocks it is recommended to start with Page 4 addresses to avoid baserom conflicts.
| Address | Description |
|---|---|
| 290 | A block that is only passable by Mario. To sprites, it will obey the Act as setting. |
| 291 | A block that is passable by sprites. To Mario, it will obey the Act as setting. |
| 292 | A block that bounces sprites! But is passable by Mario. |
| 293 | Solid to anything moving upwards. |
| 294 | Solid to anything moving rightwards. |
| 295 | Solid to anything moving leftwards. |
| 296 | Block that is solid when ON/OFF switch is OFF. |
| 297 | Block that is solid when ON/OFF switch is ON. |
| 298 | A block that shatters when a sprite is thrown at it. |
| 299 | A block that kills sprites. Does not work for sprites that do not have object interaction. |
| 29A | Block that kills the player (even on yoshi), is solid for sprites and kills on wall running. |
| 29B | Block that kills the player (even on yoshi), is passable for sprites and kills on wall running. |
| 29C | Makes Mario small, clears item box and removes balloon, flight, and slide states. |
| 29D | A Donut Lift, which will fall shortly after being stepped on. |
| 29E | Block with an endless supply of throwblocks. |
| 29F | A ledge vine that the player automatically hops above. |
| 2A0 | A block that acts like a mid-air suspended Spiny. |
| 2A1 | A block that acts like a stationary Swooper. |
| 2A2 | Sets the ON/OFF status to ON when anything (incl. dead sprites) passes through it. |
| 2A3 | Sets the ON/OFF status to OFF when anything (incl. dead sprites) passes through it. |
| 2A4 | A block that will teleport Mario to the current screen exit. |
| 2A5 | A single-use bounce block. |
| 2A6 | A block that bounces throw blocks from the side. |
| 2A7 | A coin that changes the ON/OFF state to ON. |
| 2A8 | A coin that changes the ON/OFF state to OFF. |
| 2AA-2AF | Camera Blocks (hover in Lunar Magic for descriptions). |
| 2B0-2BF | Custom Question Blocks (hover in Lunar Magic for descriptions). |
| 300-36F | Screen Scrolling Pipe Tiles (hover in Lunar Magic for descriptions). |