Super Meat Boy/(Brimstone)

Level 1-1
Three pits of lava:
 * 1) Three lava balls bounce up and down. The left and right most move at the same time. Jump across while one set is up and one is down in the lava.
 * 2) Six lava balls bounce up sequentially, making a wave-like motion. As the second or third ball falls back into the lava, leap across.
 * 3) Same as the first pit.

Glitch note: in the Xbox 360 version, as of 4-21-2013, the first ball in the first and third pits as well as the fourth ball in the second pit may glitch out and disappear.

Level 1-2
Hold left as you spawn and drop down the thin tunnel. Immediately leap across (you will barely pass safely underneath the first lava ball) and grab the bandage as the first lava ball is launched. If you can get this far, you have two choices: climb up the left hand side where the lava balls are launched from, or jump back across.
 * Bandage #1
 * 1) You can go up the left hand side as long as you don't touch any lava balls that are just getting launched. The little orange spawn-markers don't hurt you.
 * 2) If you decide to jump back across, hang onto the wall until the middle of the sequence has been reached - do not cross back to the right while there is a cross stream of balls from the left and those ricocheting off the right.

Wait until the middle of the sequence before wall climbing the right side of the chasm. The reason to wait is for the previous sequence to finish ricocheting so you don't get hit by crossfire. As the newly launched balls open up a place to wall climb, follow up the pathway slowly, below any above you and above any new ones below. Jump across and slide down the thin tunnel to finish the level.
 * Completion

Level 1-3
This level is split up into five rows where dangers present themselves (dirt row at the bottom, and the first four metal rows):
 * 1) On the dirt row, begin by running right and wall jump back up to the first level of metal. You won't have to deal with the falling lava balls if you do this quickly.
 * 2) As you reach the first left wall, hang onto the wall until you see the lava ball from the first launcher reach about half way on the second metal row, then wall jump to the right over it. Alternatively, you can stand to the left of the second metal row and wait for a lava ball to pass overhead, then jump straight up and to the right, onto the third metal row.
 * 3) While watching the lava ball launcher, jump onto the wall above it just before it fires (right after a ball drops in front of it from the third metal row), then jump up to the left over the lava ball on row the third metal row.
 * 4) Wait for a ball to come, then hop over it. Pause for a moment on the wall and wait for the next lava ball to shoot out. Wall jump up to pass over the lava ball near the left side of the fourth metal row.
 * 5) This one looks easy, but make sure you don't jump straight for the wall as there is a gap there that will cause you to perilously slide down into the lava ball launcher. Run at full speed and jump when you're about 2/3rds of the way across. You should hit the bottom of the vertical metal area.

Jump over Bandage Girl and slide down the wall. Leap onto the platform with the bandage, then do a running jump to the right to land back at the start. Being at the start now provides additional difficulty, since the first jump requires precise timing so as to not get hit by the falling lava ball from the ones that drop from the end of the third metal row. The easiest way to get up to the first metal row safely is to position yourself at the rightmost square-sized area before the pit. Jump straight up, instead of wall jumping after a lava ball passes and continue to the left.
 * Bandage #2