| Aka: | Knuckles in Sonic 2 |
| Console: | Sega Genesis |
| TV Standard: | NTSC |
| Country: | United States of America |
| Developer(s): | Sonic Team |
| Publisher(s): | Sega |
| Release Date: | 1994-10-18 |
| Players: | 1 |
| Co-op: | No |
| ESRB: | E - Everyone |
| Type: | Action, Platform |
Knuckles the Echidna in Sonic the Hedgehog 2 is the resulting game created by inserting Sonic the Hedgehog 2 into Sonic & Knuckles via Lock-On Technology. Sonic is replaced by Knuckles, and Tails is not playable whatsoever. The title screen is changed to feature Knuckles but removes the two player mode and options selections from it. This game is identical to Sonic 2 (aside from a few changes to make it more playable with Knuckles) but with Knuckles now playable instead of Sonic or Tails.
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