Not necessarily, but I did consider Velcro. I think we’d see more unique robots (and less eventual game element wearing, and maybe less static) if the robots themselves had to group together the water molecules.
But, Velcro would be a cool idea. But I don’t know how much production of that would cost as opposed to the current, plastic type game elements.
Why not combine our ideas and drop the water molecules into the waterfall? (Although I’m sure that there might be better ways to score things, like filling up “tubes” that represent water bottles.)
The scattered elements could start in a central “lake,” and then robots would have to horizontally expand to reach them. Or something.