A zone set inside a giant deciduous forest, which sees Sonic walking along large tree branches. It hosts flora and fauna in its backdrop, multiple short platforms and an elaborate maze of trees in the foreground.
It appears in the well-known Simon Wai prototype version of Sonic the Hedgehog 2. In Act 1, right at the start of the level, the way is blocked, but with the use of Debug Mode, the player can explore the little that was created of this zone. Act 2 is empty. The music that was planned for this level was used for Metropolis Zone instead and this level even has the same conveyor belts from Metropolis Zone, and many people believe there is a connection between Wood Zone and Metropolis Zone. Despite common belief, Wood Zone was not intended to be a past version of Metropolis Zone, but was rather the present version of Casino Night Zone, based on early map sketches for Sonic the Hedgehog 2.
Along with Hidden Palace, some preliminary leftovers of Wood Zone can be accessed with a cheat device. However, there is even less data of the zone than Hidden Palace, and the game drops the player off in an alternate version of the first act of Emerald Hill Zone using Wood Zone's leftover palette.
At the edge of the map, the map looks exactly like the beginning of the level, and the background turns to a very light blue, or the color of an untextured background. This happens with all Sonic 2 zones, but it is cut off by the game.