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Bonus Rounds
To play the bonus rounds at any time, insert any game into your Sonic & Knuckles cartridge. When the "No Way" message appears, hold A + B + C and press Start. If you do this with the original Sonic game you can play the levels in order and will be given a password to save your progress.
Note: In case you're wondering, I've left out the passwords deliberately. There are over 32,000 bonus rounds in Sonic & Knuckles. I can't possibly list them all on the page, nor is there much point to doing so since the levels are nearly identical.

Extra Points
When the end of act marker comes down, jump and hit it for 100 points. Repeat this to get more points.

Hyper Sonic, Hyper Knuckles or Super Tails
Connect your Sonic & Knuckles cartridge to Sonic 3. Activate the level select and debug. When you enter debug mode, create a monitor. It will have an "S" on it. Jump on it to get 50 rings and become Hyper Sonic, Hyper Knuckles, or Super Tails!

Level Select
Start Mushroom Hill as Sonic. Run to the right until you come to the first Pull-Up machine. (It's just after the box with the power sneakers and the Madmole.) Hang from it and press left left left, right right right, up up up. You should hear a ring sound. Pause the game and press A to reset to the title screen. Now hold A and press start for level select.

Debug Mode when Linked to Sonic 2
Go to the level select screen and play tunes 1,9,9,4,1,0,1,8 (the date when the game was made.) Choose any level, then hold A and press Start to activate Debug mode. To use it, see the instructions in Sonic the Hedgehog.