Tip for Challenge 10
I spent hours trying to get that final challenge and came close to calling it a day.
Finally I realised something that I could do which would help enormously and did it in about 1 min 40 secs.
My problem was that the bar for the L3/R3 move was only on half when I reached challenge 10 and never filled up whilst on the 2nd ring.
As there is no timer I decided to stay on the first ring hitting the enemy on ring 2. It took me about 3 mins of hits to get the bar filled up.
I then jumped across to ring 2 and did about a minutes worth of L1/X. Then did L3/R3 until the bar run out (about 35 secs) I then noticed that the 3rd ring was now low enough to run and jump onto and went for it.
I hope this will help someone and wished I had realised about the L3/R3 move earlier, it would have saved me a lot of swearing, grief and time on this.