Super Tails

When Tails uses the transformation, he becomes Super Tails. This originally occurred in Sonic 3 & Knuckles, where the player needed the seven Super Emeralds to transform. Tails did not change color, but instead glowed white and was invincible and surrounded by four Flickies. His speed also increase while in this transformation. The Flickies surrounding him instantly attacking any nearby mechanical enemies, including bosses. Tails usually has golden yellow fur and ruby red eyes.

Tails's next use of super transformation occurs in Sonic Heroes. Here, the player only needs to obtain the seven Chaos Emeralds and complete the game to transform. His appearance is slightly modified from the original "Super" Tails, with the addition of a golden energy sphere and the removal of the Flickies. Tails is invulnerable in this form and gains an enhancement to his normal "Thunder Shoot" ability. However the fact of this being a true super transformation is unknown as it could be just Super Sonic lending Tails his power as Super Sonic doesn't have the shielding around him.

In Sonic 2 and Sonic 3 (alone)
Super Tails can be achieved in Sonic the Hedgehog 2 with use of the debug mode. Whilst Sonic is in super form, placing a monitor and breaking it will cause Tails to be surrounded blue stars and will have increased speed (on par, if not faster, than Sonic) and invincibility. It should be noted that Sonic will appear to still be in super form and will still lose rings but won't have speed or invincibility therefore he will lose rings when damaged. This can also be done without the debug mode. First, the player must collect all of the Chaos Emeralds in 1-Player Mode. After doing this, he/she must reset the game, and enter the 'Options' menu. After that, if the player highlights 'VS Mode items' and presses the START button, then he/she will enter the 2-P level select with all of his/her collected Emeralds. If Sonic collects fifty rings and jumps, he will transform into Super Sonic, but with his sprite jumbled (the game's attempt to match regular Sonic's sprite size since he can't transform in 2-P normally). If Super Sonic smashes a teleport box whilst in transformation, Tails will turn into Super Tails. Sonic still appears Super (but isn't), and, due to the game's engine, he won't be able to get invincibility or enter his "true" Super form until he loses all of his rings (and, to get Super, collects 50 rings again). He can also enter the transformation in Sonic 3 (without Knuckles) via the debug code. If Tails smashes the "Super" monitor, his sprite will be jumbled (the game's attempt to match Super Sonic's sprite size since Tails can't get Super normally) and will acheive invincibility, but not super speed. His sprite can be fixed if you press the debug button before he transforms. In Sonic the Hedgehog 3 Complete Version, if the player enters the Doomsday Zone with Tails or Knuckles (with debug), their sprites will be jumbled the same way and also can be fixed the same way.