[big]__Level by level explanations[/big]__

__World 1-1__ When you go into the underground section, start holding "right" when Mario has fallen about half the way down and jump as soon as you're able, trying to land on the very edge of the bricks in the middle. The farther to the left you land, the sooner you start accelerating to full speed. When the pipe transition happens, you should have 380 on the timer.

Later just hit the flagpole at the very top. If you have 370 remaining on the timer, the level is flawless. If you have 369 remaining on the timer, it can also be flawless, but it's very likely you missed the framerule.

__World 1-2 (Warp to -1)__

The first difficult part here is jumping over the Koopa with the Goomba directly behind it. The best way to do it is to run at full speed and do a jump where you hold A for 1 to 3 frames and then immediately jump again.

There are two different methods to glitch through the wall at the end of the level and reach the Minus World: One is to become big Mario and glitch through the wall by duck-jumping into the corner. The fastest mushroom to grab is at the start of the level, but this makes the small jump section with the Koopa followed by 2 Goombas harder. The mushroom at the end of the level can be grabbed quickly with a mid-air jump. The other is to go through the pipe as small Mario. This trick is explained in detail in the "Useful Glitches" guide and is very difficult, but would allow for a World Record while doing the Minus Worlds completely safely.

__World -1__

A very easy level except for the flagpole glitch at the end. If you don't do it, hit the flagpole in the middle, so that you go into the castle without touching the ground. If you want to do it, let go off right, drop down landing just in front of the block below the flagpole and immediately swim. If you spend more than a few frames on the ground, you will trigger the fireworks (which is still faster than not doing the flagpole).

__World -2__

A very simple level usually. There are some very tricky framerules, so check the patterns of the Cheep Cheeps with the strategies you use before doing attempts.

__World -3__

There are 2 turnarounds in this level. As big Mario it is faster to break through the ceiling instead. It is faster still but also more difficult to glitch through the ceiling with a duck-jump into a corner. As small Mario you could theoretically glitch through the wall and skip the turnarounds too, but it is too difficult. When doing the turnarounds start holding left and bump into the opposing walls to reverse your speed.

[big]__TASes[/big]__

"RTA rules" TAS: N/A "left+right" TAS: 2:44.61 by HappyLee (TAS timing, uses left+right) "human theory" TAS: 2:33.16 by i_o_l It's important to note that RTA and TAS time the run differently. RTA timing starts when the timer appears in 1-1 and TAS timing starts on power on. They both end on hitting the axe in 8-4. Also TAS allows left+right, which is banned in RTA, but RTA allows waiting on the start screen for good RNG without time loss.