Monochrome map (Worms 2)

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Worms 2 maps (monochrome maps) are gzipped binary files, in most cases with invalid CRCs (so gzip itself cannot be used to extract them), apart from purely-seeded terrains. After a header containing the map parameters, the map data follows as a 1-bit-per-pixel bitmap. This will convert the data into a .bmp: http://tim32.org/~muzer/Delphi.dpr (made by CyberShadow)

The header has been partially reversed. This has not been tested on too many levels, so it should be taken with a pinch of salt:

Offset	Length	Description
0x00	2	0x01 0x01 if the terrain is open, 0x02 0x02 if the terrain is cavern, 0x00 0x01 if the terrain is <Random> (chooses randomly between them when the game starts, IIRC).
0x02	4	Similar to below but with the terrain generation seed, not the object seed. If the seed cannot be represented like this, see the first string slot.
0x06	4	The object generation seed in hex, little-endian (so if the code in game is 05437645, this will read 45764305). If the seed cannot be represented like this, see the first string slot.
0x0A	4	Unknown, presumably a 32-bit little-endian integer, but more investigation required. Range appears to be 0x00 to 0x64. This byte has only been seen to change when the entire level changes. Could be related to W:A's thing where the same key will generate 8 maps.
0x0E	4	Unknown, presumably a 32-bit little-endian integer, but more investigation required. Range appears to be 0x00 to 0x64. This byte has only been seen to change when the entire level changes. Could be related to W:A's thing where the same key will generate 8 maps.
0x12	4	The object count, from 0x00 (min) to 0x64 (max), represented as a 32-bit little-endian integer (presumably), which is odd since only the first byte is required.
0x16	Varies	Pascal-style string with the terrain seed. (I assume the specifics of when and when not this exists is similar to below, but since the game does not generate seeds for its own hex format, it's hard to judge whether or not this is the case)
Varies	Varies	Pascal-style string with the object generation seed, if it cannot be represented in 4 hex bytes. If it can be represented in 4 hex bytes, this is empty (length byte is 0x00 and it goes straight onto the next string). It is unknown whether this is converted into the hex using some algorithm, or if the hex is completely ignored if this is present, though I suspect it is the former, since the hex changes.
Varies	Varies	Pascal-style string with the name of level. In most cases, this will be the same as the filename but without the .lev suffix.
Varies	1	0x01 if the terrain is edited, 0x00 if seeded and not edited
Varies	Varies	Pascal-style string with the name of the level style. Exactly as displayed in the drop-down. For the benefit of those without Worms 2, they can be: ART CHEESE CONSTRUCTION GULF HELL MANHATTAN MEDIEVAL PIRATE SNOW SPORTS TIME and, with the OSSETT cheat (which gives extra levels from the original Worms), you can also have -BEACH -DESERT -FARM -FOREST -HELL (note the hyphens)
Varies	Varies	Pascal-style string with the name of the water colour, with an initial captital letter, and the rest lower case. They can be: Red Blue Green Purple Yellow .
Varies	2	0x80 0x07 - map width in pixels, little-endian (1920 = 0x780)
Varies	2	0xB8 0x02 - map height in pixels, little-endian (696 = 0x2B8)
Varies	167040	Data

If the terrain is purely seeded, then other than what was mentioned above, after the last string, there is a lot more data, but not enough to describe the entire map. What the rest of the data is is unknown.