2 Frame Jump
A 2 frame jump is the smallest jump in the game that Mario can do. By pressing, the spin jump button for 2 frames or less, Mario can make the smallest jump possible in the game, staying within 3 tiles of the ground. Kaizo levels will sometimes force Mario to make this jump by give a very low muncher ceiling and making Mario jump over a bullet or over a tiny gap. This can be a very difficult jump, but there are techniques to help make them more consistent. You can press the Button for less than 2 frames from the normal grip. Another way is to take your pointer finger and flick your finger across the button very quickly. It helps to practice this on any flat surface for a bit until it quickly becomes muscle memory. It should be important to note that if you are running, the 2 frame will naturally gain a little more height, so it should be performed standing still or with little horizontal speed.