This Wiki page serves as a list of claimed world format IDs, in order to avoid conflicts. (Of course, world format-level compatibility does not imply engine compatibility.)
Note that world version numbers can only be negative - ZZT will skip a positive world version number, treating it as the number of boards in a world.
| Start | End | Claimed by | Project |
|---|---|---|---|
| -1 | -1 | Tim Sweeney | ZZT 2.0 - 3.2 |
| -2 | -2 | Tim Sweeney | Super ZZT |
| -3 | -3 | (Unclaimed) | |
| -4 | -4 | zzo38 | FreeZZT |
| -5 | -5 | WiL | Nautilus |
| -6 | -2776 | (Unclaimed) | |
| -2777 | -2777 | (ZXT/ZAX header for Super ZZT) | |
| -2778 | -3544 | (Unclaimed) | |
| -3545 | -3545 | (ZXT/ZAX header for ZZT) | |
| -3546 | -7640 | (Unclaimed) | |
| -7641 | -7641 | (World file requiring ZXT/ZAX for parsing) | |
| -7642 | -32768 | (Unclaimed) |