I've just solved this challenge using a floater that was hardcoded a certain number of splits before it created a neuron and changed direction.
I had to resort to this because I couldn't get the oscillator to work: it did oscillate, but the maximum period was very short (9.5 h iirc), which left my organisms bouncing on the spot without covering any new ground.
So I'm really wondering what the "intended" solution looks like. How do you make it work? It's my first dive into neurocytes, so I might be missing something obvious, but I think I understood the theory.
Some challenges are hard :). Here we can discuss their solutions. Please find the thread for the appropriate challenge or create it if it doesn't exist.