Ducts is a medium size, x-axis map. It provides fast dukematching and is fitting for 2-3 players. You get to use vents to get from one part of the map to another but it might take a while to get used to how the map layout works. The level utilizes a sector-over-sector trick that makes it possible for two separate rooms to exist at the same coordinates. This makes it hard to locate players by their sounds. The level has a good selection of weapons. Tripmines are particularly fun, even a bit irritating when they end up blocking large parts of the level. Design is good with a simple selection of textures and heavy trimming.