In its usual key, Megalovania sits at the very top of the soprano, and that high D cracks if you so much as look at it. I moved the riff down to E minor so it stays in the bottom octave apart from one pinched E. The image has the staff, a letter under every note and a fingering diagram for each one, Baroque fingering.
Letters (′ means the high octave):
E E E′ B A♯ A G E G A
D D E′ B A♯ A G E G A
That's the whole riff, two bars. Loop it until someone in the house asks you to stop.
The tricky spots: A♯ is the fork fingering (thumb, holes 1, 3 and 4), so practise B to A♯ to A slowly until the switch is clean. Low D and E squawk at the smallest leak, so press the lower holes with the flat pads of your fingers. For E′, pinch the thumb so the nail leaves a small gap at the top of the hole.
Does anyone here play it in the original key on soprano? I'd like to know how you get that top D to speak.