@Mim_ I got it first go with the help of a couple of hammers. No idea why the "oops". But then again the entire 3 episodes released this week were very poorly constructed. Level 5177 was a typical example. Every time they pump out 3 episodes there are problems. I would rather see 1 episode per week that has been checked and tested before release.
I have now finished, leaving a number of useless timed boosters. When are they going to wake up that timed boosters are not wanted ??
Back to the old Flash version to collect boosters for next week !!