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SM64 - Watch for Rolling Rocks - 0.5x A Presses (Commentated) [OUTDATED]

pannenkoek2012
Explainers
YouTube
13 HN users recommended this explainer12 months2016–2024 score 15.5
Years with an HN recommendation, 2007–2026

Held up as a legendary deep dive into game internals, explained lucidly and with humor, and a gateway to the channel.

Pannenkoek2012's commentated tool-assisted Super Mario 64 run collecting the Watch for Rolling Rocks star with half an A press, using parallel universes and QPU movement. The video is marked outdated in favor of a newer version.

“This guy literally has a PhD in SM64. It's insanely complicated, and surprisingly lucid.” (HN, 2018)

7 strong recommendations · 6 recommendations · 6 citations · 1 jokes · Explainers · intermediate

20 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@ruytlm Aug 2020 Strongly recommends
on HN thread Spherical Geometry Is Stranger Than Hyperbolic
At 5:45[0] in that video, he makes a reference to one of the greatest weird explanations of video game things ever: the explanation[1] of how to beat the Watch for Rolling Rocks level in Super Mario 64 with only half an A-press, which is highly worth a watch if you like this stuff about geometry. And if that was interesting, I also recommend the history of any percent speed runs for Super Mario Sunshine.[2] [0]: [link] [1]: [this video] [2]: [link]
One of the greatest weird game explanations
@RadiozRadioz May 2024 Strongly recommends
on HN thread Super Mario 64's unopenable door has been opened [video]
I recommend this channel in general. He has extremely deep knowledge of the inner workings of the game, and presents it in an approachable way. Other classics: A 3 hour 45 minute deep dive into the game's infamous invisible wall bug (useful for understanding the linked video): [link] His most famous video, a summary of the extremely involved and complex methods required to beat a particular level using the lowest number of A button presses - in this case, 0.5 : [this video]
Deep knowledge of game internals presented approachably
@CM30 Mar 2016 Recommends
on HN thread The Rest Is Advertising – Confessions of a Sponsored Content Writer
Read more
Depends what kind of info you're looking for. Are you looking for information on the current middle east geopolitical situation? Then not really. Same deal if you're looking for some sort of longform investigative journalism like the recent one about one of the Truecrypt founders. But if you're a web developer or programmer looking for information about the latest Javascript frameworks or what not, then yes. You're going to find better information in blogs and on social sites that on a mainstream news site or publication, because the former cares about the specific subject and the latter has to try and cover a wide range of things to less of a degree. And in gaming... well, the 'professional' journalism is terrible quality to begin with. The only sites that cover anything remotely interesting are fan or volunteer run, and the most interesting sources for gaming related media are indeed social media sites. You're not gonna find anything as in depth at this on most sites: [this video] Even for more normal 'news' stuff, there are usually tons of free and fan run alternatives. For example, no one tries to get news about Pokemon from a mainstream source, because they've got other things to focus on and don't know a lot about gaming in general. Instead, they go to one of the many fan run sites, like Bulbanews or Serebii.net. This holds true for most gaming related niches, where there'll be a few sites that provide it directly (hours ahead of the mainstream media) then a flood of copycat
Example of in-depth fan-made game coverage
@roryokane May 2019 Recommends
on HN thread YouTube “Let's Play”s are preserving video game history
Read more
There are Let’s Plays that I think are better than others, but I don’t think any of them, even the best of them, are popular enough to be part of gamer culture. However, the gameplay video that I think comes closest to leaving “a mark in history” is this single video by pannenkoek2012: [this video] “SM64 - Watch for Rolling Rocks - 0.5x A Presses (Commentated)”. That’s the only video I’ve seen referenced in comments on videos of completely different games. The references are to “parallel universes” and “0.5 A-presses”, terms that are explained in this video. I don’t know if you could call this video a Let’s Play, though, since the commentary is recorded after the gameplay, it’s not part of a larger playthrough of the whole game, and the video has custom-made animations to aid in explaining the game, not just raw gameplay footage. It’s quite interesting, though, especially to a programmer. Among popular Let’s Play series, one I recommend is the Achievement Hunter Minecraft Let’s Play series: [link] . (Yup, they snagged the username “LetsPlay”.) In each episode, members of the Achievement Hunter group of players play some custom-made activity together in Minecraft. I don’t like the personalities of the players/commentators that much, but the immense creativity of the challenges and the players’ occasional funniness make it worth it. After 100 episodes it started getting repetitive though. A few other lesser-known Let’s Plays I recommend: • Cryaotic’s Undertale playthrough, Pacifist
Most culturally referenced gameplay video; explains parallel universes
@dx87 Jun 2020 Recommends
on HN thread GNU GCC does not round floating-point divisions to the nearest value
For anyone else interested in similar tricks, here is an in-depth video where someone talks about getting a star with half a button press. It starts out straightforward enough, but eventually gets really interesting when they start talking about parallell worlds that you can only access by abusing bugs to reach unrealistic speeds. [this video]
In-depth look at half-press star and parallel worlds
@devindotcom Sep 2020 Recommends
on HN thread Super Mario Bros. 3 in 3 Minutes – World Record Speedrun Explained [video]
This was interesting. I used to whine about doing this kind of glitched run, but it's just a different category of speedrun. Amazing to have that level of precision, though of course he must have done this hundreds, maybe thousands of times to get it right. If you like this kind of explanation be sure to watch the "0.5 A presses" Mario 64 speedrun video, which is equally interesting as far as getting into the hidden guts of the game: [this video]
Equally interesting look into the game's hidden internals
@bspammer Nov 2021 Recommends
on HN thread Floating point visually explained (2017)
I highly recommend watching this video, which explains floats in the context of Mario 64: [link] Games are a great way to explain floats because they're so visual. Specifically, check out 3:31, where the game has been hacked so that the possible float values in one of the movement directions is quite coarse. (If you're curious what a PU is, and would like some completely useless knowledge, this video is also an absolute classic and very entertaining: [this video] )
Absolute classic with useless but entertaining knowledge about PUs

Citations, criticism and jokes

@zzazzdsa Nov 2017 Cites it
on HN thread A look at inner workings of Joycon and Nintendo Switch
Read more
For a specific example of something like this being important, remember the (very impressive) Watch for Rolling Rocks in 0.5 A presses video from a couple years ago? [this video] (For the uninitiated, this video presents a TAS of Super Mario 64 which beats the level Watch for Rolling Rocks without pressing the A button outside of keeping it held from entering the level.) It turns out that the route presented in the video actually fails console verification, since the crazy things he does trigger some annoying FPU crashes on console, but not on emulator. There is a happy end, though: a fixed route was published after this was discovered, and it passes console verification just fine (assuming the inputs dont desync over the 13 hour run)
@ranger207 Dec 2019 Cites it
on HN thread The Outer Worlds: Fixing the “game thinks my companion is dead” bug
You might enjoy speedrunning, especially older games like those for the Nintendo 64 or the original Playstation. In addition, there's the Super Mario 64 0x A Button challenge, an effort to beat the game while avoiding the use of its main mechanic. It's not a speedrun, but the themes of exploiting every glitch possible is the same. It's also the source of the infamous "0.5x A Presses" video. [this video]
@zamadatix Sep 2020 Cites it
on HN thread Super Mario Bros. 3 in 3 Minutes – World Record Speedrun Explained [video]
Read more
The 0 exit speedrun for Super Mario World uses pretty much the exact same method (koopas and all) as well [link] SMB3 also has an interesting tool assisted speedrun (non-human doing the inputs) where fast inputs on the second controller cause an overflow on the input buffer allowing for the game to be beaten basically instantly from the start screen. If you like this because of the interesting stuff done to abuse the game The Legend of Zelda Ocarina of Time has pretty much been a history of "and then a quicker way to corrupt the game was found". It's not always about going fast either, challenge runs also get a lot of very interesting results from a lot of dedication. Super Mario 64's A Button Challenge (try to beat the game with as few A presses as possible) has tons of outrageously complex tricks with amazing explanation videos. One in particular caught people's attention to the point it became a meme [this video] though it's not actually the most technically impressive to come out of that endeavor.
@chungus_khan Nov 2020 Cites it
on HN thread 1.5 is the midpoint between 0 and infinity in Ruby
This video goes into something vaguely related with how the coordinate system works in Mario 64: [this video] There's a lot of interesting problems that arise when making a 3d game vs a 2d one.
How Mario 64's coordinate system works
@hn92726819 Jul 2023 Cites it
on HN thread Super Mario 64 – Watch for Rolling Rocks – 0.5x a Presses [video]
Read more
I could see how this could be confusing. SM64 does distinguish between before a release and after a release, so technically the game itself doesn't care. I think what they were trying to say is that there really isn't any benefit in speedrunning the game to keep track of releasing (and this can be confirmed in the video too: [this video] ). I think it's possible that if the next level requires .5 a presses but, for example, you are falling with a wing cap in the current level, you have to decide between bumping that half a press into a full a press or losing time when falling with the wing cap. I just don't think it's a common case though because you could use a different route where the held A won't affect you. It looks like in the A Button Challenge (ABC), there are only 5 half a presses: [link]

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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