So, consider Wing Mario Over the Rainbow, not even the whole star, just getting to the cannon platform, which is a necessary part of getting the star. So, how many A presses does it take to get there? Well, if you say zero that’s wrong because then Mario can’t go far enough. If you say one, well, it’s true that Mario can get there with one, but we can do better. We can get there in half an A press. To do that, we start the level already holding A and then we use that A press to reach the platform. Now hold on, I know what you’re thinking, “An A press is an A press, you can’t say it’s only a half!” Well, TJ “Henry” Yoshi, hear me out. An A press actually has three parts to it, when A is pressed, when A is held, and when A is released. Now, usually is the pressing that’s useful because that’s the only part that makes Mario jump, however, sometimes it’s sufficient to just use the holding part, which allows Mario to do little kicks, to swim underwater, to fall slowly while twirling and to fall slowly with the wing cap. And as for the release, well, there’s currently no cases where that’s useful or important, so don’t worry about that part. Now, if we map out the required presses for Wing Mario Over the Rainbow it would look like this: _//. We merely need to hold (_) A to reach the cannon platform, we need to press (/) A to launch from the first cannon, and we need to press A again to launch from the second cannon. So, how many presses is that total? Well, it appears to be three, and if we were doing this star in isolation then yes, it would be three, but in a full-game A Button Challenge run there are other A presses that occur earlier in the run, such as the A press needed to get into the course, so if we take that A press into consideration as well, then how many A presses does it take? The naïve answer would be four, one to enter the course, and the three within the course we established earlier, however, we can do better. We can actually do it in three by simply holding out the first A press to be used for the half A press, because the half A press only required A to be held, not actually pressed, so in this fashion, Wing Mario Over the Rainbow only adds on an additional two A presses to the run, since the first A press just leeches off the previous A press, so to capture this phenomenon, we call it 2.5 A presses, on a single star basis, you’d round up that up to three, but in a full game run, you’d round it down to two. So, in conclusion, since that first A press counts in other contexts, but adds no additional presses in other contexts, we refer to it a Half A Press.