"In that case, I suggest we go back to Lazarus's place. Someone is going to need to open a door eventually if we want to find Milliways again, and I notice a distinct lack of those up here."
"Hello Kolya I went to the moon!" says Lazarus, beaming. There is no response, but this doesn't seem to perturb him.
Libby has already discovered, in dealing with the double handful of sevens she collected earlier, that a single coin can apply safety to many more of its own level. It won't be a problem. She might ask for an extra six and an extra seven to get up to that level in the first place, but she won't need more than that, in an absolute sense.
"I think I'll go tell Chris what an interesting afternoon I've just had," says Libby. "If you find Milliways, call me. I'll do likewise."
An hour or so later, the elusive Kolya announces from the hallway, "There's a bar in the closet."
"Hi, Kolya," says Chris, to the seemingly empty air previously occupied by a visible Kolya. "Or not. As long as you've still got the door, I guess."
"How many eights have you got?" inquires Libby as the rest of them follow her in. "We should divide them up equally, and then I'll safe them. It takes one coin to do one of the next level up, or one coin to do a batch of the same level - I haven't discovered a limit on batch size yet. Hmm, I should give the coin sorters a feature for passing directly to someone else's sorter, faster that way and with less chance of dropping any - spare me a six? It shouldn't take more than that to make the change for all four of us."