Not sure how much time I'm going to have for this, but I started last weekend. I realized I'm pretty terrible at games nowadays.
First run through, I thought I remembered the proper warp path, but I didn't. I ended up in World 5 after my second warp, and I knew something had gone wrong. I GO'd in World 6. Looked in my NES Atlas, oh yeah, that's how you warp to World 8. Had a bit of a tough time with World 8, but made it through to the castle with 1 life. Didn't have to use the Atlas to solve the maze, made it to Bowser as little Mario. I was biding my time, waiting for the perfect spot to run underneath him... and then a fucking flame glitch-appears right in front of me and kills me. Seriously, never fucking seen that happen. So yeah, ragequit over here, but totally justified. What a crock of shit.
When bowser spits a fireball but it doesn't show on screen? yeah i got nailed several times due to that since I have a tendency to wait way too long. Extremely frustrating; that "fight" is horrible as small mario. I decided to go back and learn 8-1 and 8-2 well enough that I could keep fire flower the whole time rather than fighting with hammer bros in 8-3 for it. I have to proceed a bit slower through those stages (mainly 8-2) but oh well. Took me for 4-5 game overs to get it down but ended beating it with no deaths (with warps) tonight. I'm happy with that since I haven't really played it in almost 20 (edit) years (usually went to mario 2 or mario 3 for my NES mario fix). Surprised i remember where the warps were (well I also warped to stage 5 my first time as well) and also the path through 8-4.