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 beta version of Sonic 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. When taking into account that time travel was intended to be a feature at one point, it's possible that Wood Zone is Metropolis Zone's "past" version, similarly to how Rock Zone was intended to be the past version of the scrapped Dust Hill Zone.
The Wood Zone makes an appearance in the Archie Comics, as one of the world's locations following the Super Genesis Wave. Sonic and Tails go there looking for Chuck and Antoine, and also meet Muttski.