Weight

The Weight (ウエイト), or Black Slab, is an obstacle that first appeared in Sonic Adventure 2. It is a large slab that falls down on the player when passing under it and causes damage, but can also be used as a platform.

Description
Generally speaking, the Weights are large rectangular blocks, most of which appear to be made of metal while others appear to be made of rock. Their design slightly differs from game to game, but they are usually dark grey in coloration with red outlines.

In gameplay, Weights can be found in various Stages where they float in midair. When the player get down below them though, they will fall down and squash the playable characters. Unlike Crushers though, which will cause the player to lose a life when they fall down on the playable characters, the Weights will only cause the player to take regular damage. After having fallen down, the Weights will then rise up into the air again, and try crush the player once more if they remain under it or get under it again. However, they also have a helpful side, as the player can climb on top of Weights as they rise, which makes them work like rising and falling platforms.

Sonic Adventure 2
Weights first appearance was in Sonic Adventure 2 and its remake Sonic Adventure 2: Battle where they resemble completely black blocks with a hook on the top and red outlines on the edges. They can be found in Stages such as Pumpkin Hill and Mission Street.

In this game, Weights can be controlled by Switches throughout the Stages to reach otherwise unreachable higher areas. Using a Switch connected to a Weight is signified by the Weight's red outlines being disabled and the Weight itself rising up into the air. However, this effect is only temporary and will wear off after a short while.

Sonic Heroes
In Sonic Heroes, Weights are still black stabs, but have a more detailed design, with rounded edges and corners, red outlines at the edges of the bottom and yellow-green lights on the corners. Whenever a Weight is about to come down or rise up, the yellow-green lights on it flashes. They can be found in several locations like Power Plant, Bullet Station, Lost Jungle and Hang Castle.

In this game, certain Weights can be destroyed by the player with any playable character. Such weights can be recognized by their more prominent purple colorations, greater thickness and smaller surface area.

Shadow the Hedgehog
Weight also appeared in this game regaining it's appearance from Sonic Adventure 2, but with one red column instead of two. Weight only appeared in Black Comet Stage. In this game the player can stop it's move by shooting at it, after shooting it will stops moving for a short of time and then returns to move.