Super Metroid is a game where the developers did make revisions so that the game would play at the correct speed on PAL consoles. But those tweaks still end up

Super Metroid is a game where the developers did make revisions so that the game would play at the correct speed on PAL consoles. But those tweaks still end up making material differences in gameplay, especially in a speedrunning context, because the slight differences in physics constants and animation timings can make a difference when exploting glitches or race conditions. For example, the slower framerate makes it easier to clip through things, because Samus and her projectiles move more pixels in one frame, so this gate glitch can only be done on PAL: https://www.youtube.com/watch?v=RvyIwtO_qgM https://www.youtube.com/watch?v=RvyIwtO_qgM Also, the developers properly adjusted Samus's physics constants and animation timings for the new framerate, but they didn't adjust enemies, cutscenes, or other aspects of the game environment. So Samus moves at the same speed as on NTSC, but the rest of the world moves slower. This means that on PAL you can grab Bombs and escape the room just in time before the door locks, skipping the miniboss fight: https://www.youtube.com/watch?v=R3t8TIIj7IM https://www.youtube.com/watch?v=R3t8TIIj7IM On the NTSC version, that same skip requires a complicated setup and several dozen frame perfect inputs in a row, and only one person has ever managed to pull it off: https://www.youtube.com/watch?v=jcKUMk5g8Wk https://www.youtube.com/watch?v=jcKUMk5g8Wk Here's a comparison of the fastest tool-assisted speedruns between NTSC (left) and PAL (right): https://www.youtube.com/watch?v=KD_-thqcB5s https://www.youtube.com/watch?v=KD_-thqcB5s Both runs take the same route up until the very end; the NTSC version is faster in almost every single room, but PAL ends up finishing first because the arbitrary-code-execution setups are very different. The NTSC run has to do a very slow sequence of pausing and unpausing to move through a door without activating it, in order to get out of bounds and trigger memory corruption. Whereas on the PAL version, we're able to exploit a race condition in the game's animation system to achive ACE fully inbounds. The race is between a spike's knockback timer and Samus's landing animation; because Samus's timings were revised for PAL but the spike's were not, the timing works out a little differently and the race ends up being exploitable in this context on PAL but not on NTSC.