Size Beam

Size Beams are lasers that appear in Sonic CD they are found in Metallic Madness on Little Planet.

Description
The generators are usually fitted in corridors to shoot lasers down towards the ground. If Sonic (or Tails in the remastered verison) are caught in the beam, it will alter their size. The red lasers cause Sonic to become ⅔ of his own size. This will allow him to run through corridors more smaller than his default size will permit.

The white lasers will cause Sonic to return to his default size.

Sonic the Comic
In Sonic the Comic Issue 27, Part 4 of the The Sonic Terminator story arc, A midget version of Sonic from the near future encouraged Sonic into the beam to make him small as well. This was so that Sonic was able to infiltrate the machine in Miracle Planets past to disable it.