The grade skill needed for each movement of Moonlight Sonata is as listed (by Irish - LoonY):
1st movement - 5/6 but requires that extra special something to make it unique (harder than it looks too! especially with bringing out the melody in the right hand)
2nd movenet - 7, former Grade 7 piece
3rd movement - DipABRSM Extremely dexterous technique needed here!