Laser field

The Laser Field Block is an obstacle that first appeared in Sonic Adventure. It is a wall of laser beams that serve to block the player's path.

Description
The Laser Field Block is like a wall made of red lasers which prevent the player from going into the area beyond it. They primarily consist of several slots that generate the lasers, forming a close grid that the player cannot pass through. Sometimes these slots are attached to the walls while others times (when they form a grid in midair) they are held up by two straight poles parallel to each other. The slots are arranged so the lasers they create are either vertical or horizontal. The Laser Field Block mainly serve to hinder the player's progress, but can also help mark the boundaries of the levels. Additionally, touching their lasers will damage the player.

Over the course of the series, Laser Field Block had maintained its appearance, albeit with some minor changes. They can also sometimes be deactivated with Switches.

Sonic Adventure
In Sonic Adventure and its remake, Sonic Adventure DX: Director's Cut, the Laser Field Blocks are generated from small floating objects called the "Spark Units" between each units. The units can be destroyed with with a Homing Attack or Amy's Piko Piko Hammer to break up their Laser Field Block (note that only one unit is enough to break a field). They only appear in Final Egg.

Sonic Adventure 2
In Sonic Adventure 2 and its remake, Sonic Adventure 2: Battle, the Laser Field Blocks consist of slots which shoot out lasers either vertically or horizontally. The lasers generated by the Laser Field Blocks in this game are somewhat unstable though. In Cannon's Core, the lasers can all be stopped by the Time Stop Switches, but only for a short time.

Sonic Heroes
In Sonic Heroes, the Laser Field Blocks have the same design as in Sonic Adventure 2. In this game, the lasers created are more stable and can be turned off by finding a Switch. Espio can bypass them unharmed after he uses Leaf Swirl. In some cases on the PC version of the game, the player can use the Jump Dash on some of Lasers Field Blocks to get through them, but it is not recommended.

Shadow the Hedgehog
In Shadow the Hedgehog, the Laser Field Blocks are sits of horizontal lasers generated by small slots between two walls, some which move and some do not. They mostly appear in the Black Comet where they sometimes can be turned off by destroying nearby enemies. Alternatively, they can be bypassed using Chaos Control.

Sonic the Hedgehog (2006)
In Sonic the Hedgehog (2006), the Laser Field Blocks are given a slight upgrade in design, receiving two poles to hold the slots generating the lasers so that Laser Field blocks can be formed in any place, and not just between walls. Those Laser Field Block lasers are always horizontal and when they block a path, the player has to find a Ball Switch to turn them off.

There are also Laser Field Blocks which have the same design from previous games, except their slots create both horizontal and vertical lasers which turn on and off in intervals which make them hard to evade. However, the player can slide under these lasers using by Sliding Attack and Spin Kick. Sometimes, the Laser Field Blocks can also be bypassed using Shadow's wall glitch or Sonic's Scale.

Sonic Unleashed
In the Xbox 360/PlayStation 3 version of Sonic Unleashed, the slots for the Laser Field Blocks can be attached to both walls and two parallel poles. They most prominently appear in Spagonia's Entrance Stage where one particular Laser Field Block even blocks the player from the Wall Jump Shoes. In this game, they can be turned off with Switches, Levers and by destroying Eggman's minions.

Sonic Generations
In the console/PC version of Sonic Generations, the Laser Field Blocks have the same design as they had in Sonic the Hedgehog (2006). In this game, they are only encountered during the Challenge Acts. Usually, they cannot be turned off and serve mostly as blockades along the player's path.