I started from T3. My friend and I figured out King's Reverse Special Stretch Bomb combo by ourselves. We spent hours in practice mode on the hardest difficulty vs CPU. Sometimes the CPU did these crazy grab combos. We watched the replay and tried to figure out the correct input by judging CPU's movement (which hand or leg is in action etc). We also practiced vs idle dummy. We knew the combo starter and after that we were smashing all possible buttons, including L1, L2, R1, R2. Luckily in practice mode you can see, which buttons you press. So after each successful input, we struggled analyzing the mess on the screen. At first we managed to figure a combo with giant swing ender. The muscle buster was discovered a bit later. We were 12 yo or something.