RTA Guide/Bowser in the Fire Sea
Bowser in the Fire Sea is located behind Dire, Dire Docks in the basement. 30 stars are needed to access it without the use of a MIPS clip or SBLJ.
Note: This video is slightly outdated, since you will want to get the second red coin before activating the elevator as shown in the Advanced video. This is faster and easier than doing it in the other order.
Advanced (Lava Boost Early Ellies)
Cage Movement Variations
After Cage Movement Variations
Advanced (Early Cylce)
Pole Glitch is a very precise trick where it is important to do dustless movement. You want to maintain Mario's speed the best you can starting from this image.