Room 6 Go under the corner fireballs as fast as possible, then jump and dash to skip waiting for the middle fireball.

Room 7 Dash as soon as you enter the room, land on a pillar, then wait a little and dash into other pillar, then dash under the fireballs. Here is a screenshot of the aftermath http://ibb.co/fbYdy7

Room 8 Dash between first and second fireball, then time perfectly your next jump and dash, to go above third fireball, below second and above first. This trick is very hard.

Room 10 Land on the lower pillar, then hit the column second time, then land on a middle pillar, then break the column.

Room 12 Dash as early as possible under the first firebal, then dodge the second, then break the column as fast as you can. This is another hard trick. I haven't used this one in my 2:35.

Room 13 Get to the column as fast as possible, then break it as fast as possible to skip waiting for the lava.

Room 14 Dash under the middle lava as soon as you enter the room, then jump and dash above the corner lava as fast as possible and hit the column, then jump and hit the column second time, then dash under the corner lava, then jump and go above middle lava. Another hard trick.

Room 15 Go fast to skip waiting for the lava.

Room 16 Get to the column as fast as possible, then break it as fast as possible to skip waiting for the lava.

Room 20 Dash into the dragon block while falling.

Room 21 After hitting the column second time, jump and dash into the middle platform, then break the column.

Room 22 Jump as soon as you enter the room, then dash above the first lava as early as possible then dash back as fast as you can, then dash in the opposite direction of your previous dash as fast as you can.

Room 27 Step 1 http://ibb.co/mF6Z5n Step 2 http://ibb.co/hur95n Step 3 http://ibb.co/iX0VBS Step 4 Jump and break the column

Room 28 Jump and, as soon as you hit the ceiling, dash, then instantly dash back, then hit the column second time, then jump and break the column.

Room 29 HIt the column first time, then jump and dash into column as soon as you hit the ceiling, then instantly dash into this http://ibb.co/dUxhQn dragon block, then instantly dash back and destroy the column. Another trick I didn't use in my 2:35.