I feel like I'm missing something very obvious, but the only solution for Level 10 I find seems to be a bust - to clone a ton of gliders and get them to hit the toggle button and stop the fireball clonage.
Zommy (Richard Blaquière)
CLP1-fixed.dat - 40 levels
CLP2.dat - 30 levels, incomplete
RichardB1.dat (consisting exclusively of CLP1-fixed and CLP2 levels) - 58 levels, incomplete
CLP1-fixed.dat - 40 levels
CLP2.dat - 30 levels, incomplete
RichardB1.dat (consisting exclusively of CLP1-fixed and CLP2 levels) - 58 levels, incomplete