Scroll down to see spoilers for the end of the Yellow streamer. Hole Punch is the 6th boss in the game, whom of which guards the end of the Yellow Streamer. It's late, but early into the game, making it a spoiler to talk about Hole Punch when somebody has never seen any footage of the game. You have to do 2 quests to fight him. After going through 1 cutscene. The first quest involves you going to find the "Thrills At Night" Disc in the coffin room. Then you have to carry a boombox through the temple collecting Toads with their faces punched-out. Sit through the last cutscene so you can fight Hole Punch. His attacks involve around... you guessed it. A Hole Puncher. The first attack that Hole Punch uses is........ Hole Punch! He punches a hole in your face. This makes your Max HP decrease in half. You can get more than 1 Hole in your body. The more holes, the more Max HP you lose. His other next attack is Spitting Punches. Hole Punch spits out the Holes that he punched out. There is also a tile for your punched-out face. When you step on it, your Max HP goes back to normal. The final attack is "The Whole Punch", It's just Hole Punch, but it punches 2 holes instead of 1 hole. You can avoid this attack by using the Earth Vellumental Magic Circle because Hole Punch does not punch it out since he charges up the attack. You can only attack it from the Black Back of the Boss.
this took me about 2 hours lol