first of all, DO NOT use the doorway to your right. it may be faster, but I (after self research so this may not be accurate) found the glitch way less consistent. instead, go to the glass hallway (the door to it is in the top right at the start of the level). IF YOU HAVE A MONITOR LESS THAN 60HZ, USE WEAPON-WHEEL SLOWMO this took way too long for me and my 21:9 monitor to figure out. collision in ultrakill (and unity in general) is calculated per-frame, meaning the less frames, the more imprecise the game becomes. If you do not use slowmo with a 30hz monitor for example, you will be stuck in the ground. ok now that that's out of the way, it should (at first) look like you are stuck in the ground. this is normal. IN SLOWMO: crouch, then dash to clip out. you have now successfully performed the glitch.

So a couple things to note. First off you are going to make a guide, Please make one in the guides section instead of making a forum. Second off, there are not any doors you can use to clip out to the right at the start of the level so I assume you mean to the left. Third, door clips work by when the player stands from a slide if they are above a crack in the ground then the game will incorrectly resize the player to be clipped into the ground. This is why the most consistent way to get door clips is by hugging the doorframe and spamming slide. By facing the doorframe you can reduce the distance traveled when you slide and by spamming you can get more attempts in a smaller area meaning you are more likely to clip sooner. If you are having trouble because of framerate make sure in the settings you have target framerate set to none and Vsync off. Using slowmo can help as it also reduces the distance between attempts and does let the game run more collision calculations but is largely negligible at decent framerates. Most runners use the closer door because it is not really harder and is generally much faster. Lastly, I don't know who are. You don't have any runs verified and only have a couple runs submitted for verification. Its probably better if you don't try to explain things that you are not well informed about.