We found that you can have fun emitting bridge sections while swinging the bridge emitting arm around. We also found that the bridge sections can get in the way, and that you can just emit lots on one gap to easily bridge it, so we limited number of bridge sections that can be emitted to one at a time.
The tank was good fun, but we decided that what we also wanted something that actually fires missiles. Technically (here comes the science bit), the tank fires projectiles, which aren’t self propelled, and we want missiles, that zoom towards their target rather than arcing towards them like a grenade (okay, not very scientific).
Making these guys actually go in the right direction was quite a challenge. Have a go yourself and you’ll see that quite a few factors come into play: what it’s made of, the angle it’s launched at, exactly where the rocket is attached, the power of the rocket, and the position of any explosives attached to them. Lots of fine tuning (and the invention of the microbomb) later, and it was done. Lovely.