Heck, Chemical Plant and Aquatic Ruin even give a chance for drowning. A rogue Buzzer/Coconuts/Spiny can still hit even the most experienced players.
Now, the first 3 levels are admittedly not the biggest challenge, but at least in them there is a chance to get hit. In my honest opinion Casino Night is the most boring level in all of Sonic 2. Now, I know this is a very popular level, a lot of people love the Casino Night. Obviously, I'm talking about Casino Night Zone (Well, obviously if you read the title.). So I was having a bit of a debate with a friend of mine over MSN about a level in Sonic 2 that I know is liked by a lot of people.