Emulator used: Snes9x 1.43 Improvement9

Sync settings:

This is my atempt at an improvement over Adebis old run of Lost Levels, it is 434 frames faster. I choose the +Super Mario World rom because the last author used it and it was a few frames faster in the intro. I found improvements in many levels but due to a frame rule not all of them where allowed to be kept in the end. Therefore I will only write about the levels where the improvements where kept at the end of the level. Worth to mention is that ending a level 1 timeunit sooner will not always gain you time (I think), and likewise ending it on the same timeunit might gain you time. Also sometimes (I think when you are close to a timeunit decrease) ending the level by jumping further up the flag can gain you time.

Suggested screenshot: 88400 (everything about it just looks wrong)

All improvements are 21 frames unless I say otherwise.

1-2

When going through the wall I do a backwardsjump and run over it instead of through it.

2-1

Did a backwards walljump instead of a normal one.

3-2

Bumped into the roof to gain momentum when going down the shaft. Also possibly better pipe entrance.

4-4

When going up at the firepillar I did a walljump instead of jumping on the platform. And when going down again it was faster to not pass through the wall.

5-3

Got a jump boost of the red koopa to get to the pipe without hitting the wall first. Also I noticed later that it would have been faster to run to the end of the moving platform in the begining, actually enough to gain me another timeunit I belive. But it was actually just as fast in the end.

6-1

Walljumped up the pipe instead of passing through it.

6-2

Swam up to the surface on the right frame to give me a big downward momentum boost when going down the shaft.

6-4

At the first big firepillar I did a backwards crouchhjump to get through sooner and with much greater speed. When going to the top level for the "bing you choose the right path sound" I jumped up at the first opportunity instead of the second. At the decending platforms I jumed onto it instead of over it, if crouching on the last possible frame the game acts as if you are in crouched position but it looks like you are standing up, this allows me to seemingly pass through the wall. Did a crouchjump at the last firepillar. (42 frames saved)

7-2

Faster jump from the platform to land.

7-3

Jumping on to each trampoline at the first possible frame.

8-2

Managed to jump further up the vine before starting to climb.

8-3

Faster jump up to the hidden block, better jump of the moving platform

8-4

Tripple backjump instead of double. Shot the plant to get down the pipe faster. (no idea why he didn't) Much much faster entering the pipe in the water. It looks like you could get under the firepillar but you can't, it's impossible to swim under and I walk under it as soon as possible and start swimming as soon as possible. (63 frames saved)

9-1

Entered the pipe faster by jumping down instead of running over the edge. Also funne glitch at the flagpole, if using left+right at the right position mario acts funny and the flag doesn't get lowered. Don't save time though. (9 frames(!?) saved)

A-4

Better playing at bowser so that I would not need to slow down as much.

B-2

Faster to go down the shaft instead of passing through the upper wall.

C-3

Same as 7-3, also at the end I juped over the firepillar instead of wating for it. No idea why he didn't.

C-4

Jumped through the roof instead of going through it. Sligtly faster passing through the wall at the firepillar.

D-1

5 frames saved... dunno how really.

D-4

Just before bowser I jumped down the platform instead of running over the edge. Ended input a little earlier. 7 Frames.

Somewhere here and there I have gained 1 frame. (and sowhere I think lost 1 or so) I don't know why.

NesVideoAgent: Hi! I am a robot. I took a few screenshots of this movie and placed them here. I'm not sure I got the right ROM though. (I tried Marvel Super Heroes - War of the Gems (U).smc, which was the closest match to what you wrote.) Well, here goes! Feel free to clean up the list.
Bisqwit: Well, it looks like the bot was utterly confused by the way you entered the ROM name. Removing bogus screenshots...

adelikat: Replaced the submission file with a hexed version that indicates the good ROM dump: Super Mario All-Stars + Super Mario World (U) [!].zip). (It does sync on this version).

Also accepted and encoding.