Why Stomping Wigglers Glitches Super Mario World

Why does stomping on wigglers produce glitched graphics? It's all explained right here.
LINKS
INLINE LINKS

[kingcrimson]

old games: we reused half of the face texture for the butt sprite to save space
also old games: bible length of unused code and data

[gretarreynisson]

Man, I spent hours of my life stomping… Wigglers, in the original Super Mario World.

[huks.]

It's funny that Crash Bandicoot 2 and 3 have a variant of the same bug; the game lets you gain increasing rewards by bouncing on enemies consecutively, and the devs didn't put a hard cap on the value, and they overlooked the fact that there are some spots where you can rack up unlimited bounces by bouncing on an arrow crate for several minutes then landing on an enemy. This makes the reward table go out of bounds and give you bogus rewards including crystals and gems from other levels.

[MarioFanYT]

For some reason, the 5UP sprite has always fascinated me. Its upside down and shifted sprites intrigued me, because it's still there and you can see it's there when you look at the glitched sprite. I didn't know the blue-green colour palette for it was a glitch, or that the garbage attribute data was responsible for vertical and horizontal mirroring.

[vulcan]

Oh boy, out-of-bounds tables resulting in garbage data being read, my favorite

[cappantwan]

Mario steals the life force of baby Yoshis to keep the grim reaper at bay. What horrors must we endure to achieve immortality?

[itskdog]

As someone who watches with subtitles on, I appreciate you moving the subtitles to the top when you do any animations at the bottom of the screen. If I could give a second like on the video I would!

[AndrevusWhitetail]

I always found it weird that if you eat a wiggler while on Yoshi and are running too fast you can TAKE DAMAGE AS MARIO without losing Yoshi in the process.

[lior_haddad]

Maybe the E0-EF sprites were originally moons? They seem to be used for "harder" things to acomplish, which is what 3-up moons are for?

[JamesR]

0:31 It makes me VERY happy you're keeping this being a thing. It's nostalgic and makes me feel like I am watching a PBS educational show in the best possible way.

[JanusHoW]

I remember using the Wigglers to max out my score in Super Mario World. Neat to finally know why it happened.

[stefanfjellander]

yet another entry in "Super Mario World Indexes Table Out Of Bounds, Shenanigans Follow"
great work, as usual!

[Justin-TPG]

With the first discovery (end gate items check table), I believe this is an example of the developer planning ahead and then reining in the outcomes due to one of many reasons such as running out of time, not liking the idea, or finding a bug in testing, so they instead decided to link numerous status combinations to the same outcome.
With the second discovery, enemies not using the same stomp reward routine, this is a prime example of why you should not copy and paste code and should instead have one routine that all instances of a scenario point to. Not only do you save space in your program, you also avoid the risk of forgetting to update the routine to be the same as another version of it that you’ve fixed or settled on. Nintendo should have had one routine but instead have ended up with three that all have different behaviours.

[varietychan]

3:28, maybe the super star was intended to go into the reserve box as there are unused graphics for a star in reserve

[itstaifuni]

I don’t think anyone appreciates how each of your videos gets themed around the game you’re exploring, but I wanted to thank you for scratching that perfectionist itch in the back of my head.

[TheSavageBountyHunter]

My hat goes off to your for the commentary.
No corny jokes ..
No long stretched out intro ..
Just straight to the point
And I like how you speak as if this is an educational video that would be watched in school or maybe a training video for a job 😂❤

[PearangeProductions]

That "viewers like you, thank you" bit at 0:32...that was totally the PBS broadcasting credits thing, wasn't it?

I had the biggest & dopiest nostalgia-fueled grin when I realized what you were referencing when you said that.

[GreyWolfLeaderTW]

Ah yes, our old buddy, "Inadvertently reading code and data out of the intended range to produce nightmare crazy unintended outcomes" glitch.

[rzeka]

12:47 I actually said "ohhhh" out loud. The whole video i was thinking "ok but why are the sprites past 3UP flipped?"

[thecunninlynguist]

I actually never knew the power up changed. I always thought it was either a mushroom or 1up. Never seen a feather/flower in my years of playing through the game, lol.