Once you solve this on your own, you may want to come back and read this to see if it's how you solved the puzzle. It'll be a particularly tough challenge in some of the later production missions. This is going to be a constant theme in the rest of the game, where circuits have to work independently and asynchronously from each other. Use some syncs to make sure you never try to drop a second H until the first has been bonded by the other circuit, and you're done. You can use a flip-flop to switch between the left and right atoms, and merge their tracks so they always go to the same drop point. If you set the system up so that two of your bond pads are under the H2 input, you now have two H atoms. The other puzzle is to take your input atom, and bond the appropriate number of H atoms to it. One is to produce a constant stream of unbounded H atoms. The best way to think of this puzzle is as two separate puzzles. I'm going to put this in a spoiler tag, so you can take a few more cracks at it before getting a more explicit tip. There's also the fact that random inputs are actually 'even' every 12 inputs will include 6 Phosphorus and 6 Silicon atoms, though you certainly don't need to know that to complete this puzzle or any random puzzles. If you get a Phosphorus atom again, then this time you can use that spare molecule and only bring through 1 Hydrogen molecule.Īlternatively, what if you ignored the fact that the inputs are uneven? It's awkward that you have 2 Hydrogen atoms in each input.In state 1, if you get a Silicon atom, then you don't need to use up that spare atom.This moves you to state 1, because you've got 1 spare. If you get a Phosphorus atom, then bring through 2 Hydrogen molecules and bond them to make Phosphine and a spare Hydrogen atom. Recorded solution for 'Accidents Happen' from SpaceChem, a design-based puzzle game from Zachtronics Industries.Download the demo at.If you get a Silicon atom, then bring through 2 Hydrogen molecules and bond them to make Silane.

Initially, you have no hydrogen atoms stored.It could lead to a stockpile if you're not careful, yes! So, keeping that in mind, what you need to do, is make sure that you use up that stockpile. Any time you can avoid manually grabbing/dropping molecules at all it will usually lead to big savings. More concretely, I'd suggest looking for a way to place your bonders/construction so that you can avoid moving the second hydrogen entirely (or only trivially moving it as part of debonding the first one). Very often the answer is there's some assumption that is restricting you. Re: doing something with the hydrogen - my most general tip is whenever you run into 'it's annoying that I have to do X' in SC you'll want to try to hit yourself with an 'but do I actually though?'. I'd say the agnosticism approach is probably more conceptually useful learning-wise and more likely to get a solid solution with, but if you enjoy complex case-handling paths the first approach is interesting and can be optimized very far too. I'm prepared to bet Zach didn't have an intended approach in mind since for some later levels he's mentioned he just created ones that 'looked solvable' and hasn't actually solved them all himself :P

Spacechem accidents happen