http://www.cgi101.com/~jman2050/s3kcasual.zip
After a lot of deliberation (2 seconds worth), I decided to play Sonic 3 and Knuckles for the heck of it. The run turned out relatively terrible. I died 6 times, some of them not being my fault really... Also, if there's one thing I learned while running this, it's that Tails is a bastard and that all S3K runs should be done with Sonic alone. Stupid fox...
Level-by-level impressions
Angel Island: First act was good, second act was good, even did the somewhat risky quick kill on Robotnik.
Hydrocity: First act was good, second act was okay. Made some stupid mistakes.
Marble Garden: I hate this zone. First act was good, second act was merely okay, with one death.
Carnival Night: First act was near perfect. Second act was meh.
Ice Cap: First act was pretty good, and I elcted to take the bottom path using the wraparound glitch. Unfortunately, a fluky death put me back on the top path, defeating the purpose :/ Boss was terrible.
Launch Base: First act was good, second act was good except for the bosses. FU Tails.
Mushroom Hill: Both acts were done almost perfectly by my standards.
Flying Battery: Both acts were meh, nothing too noteworthy
Sandapolis: This zone sucks. First act took way longer than it should have. Second act was fine, but this quite possible might've been my absolute worst performance against the Act 2 boss in my entire life.
Lava Reef: First act was beautiful until a few mistakes in the end. Second act was great. Boss was perfect.
Sky Sanctuary: Pretty good until Metal Sonic. I tried to rush the fight, and got burned as a result.
Death Egg: I never did get the hang of the first boss' second form. Took a bit of luck to finally beat it. Second act was pretty good, but I got a cheap death on the final boss because of Tails again. Argh.
Total time: About 1:40. Not my best playthrough of the game by a long shot.