Tag: Bird Brain

  • Solution to the BirdBrain Puzzle

    I posted a very hard puzzle here and challenged the Internet to solve it. It’s quite a hard puzzle and it took about a day from originally posting it for someone to solve it. That someone was Mark Ivey (@zovirl). I asked him to write a quick description of his solution and he did up a very nice little post which I thank him for. Here is Mark Ivey’s solution to my puzzle:

    The Solution to the BirdBrain Puzzle by Mark Ivey

    Overview: A down-and-left circuit moves the birds to the first & last yellow pellets. A decaying memory circuit bounces the birds up off the red ball. Since this loop decays over time the birds will go down again after clearing wall #2.
    Down-and-right circuit
    To bounce up, the birds have to hit the ball from the top. If they hit the side, they’ll bounce at the wrong angle.
    The right signal is slightly stronger than the down signal to make sure the birds get over the ball before hitting it.
    Decaying Memory Circuit
    Bouncing up requires reversing the ball signal. Keeping the birds moving up after they hit the ball requires a memory loop. When a bird hits the ball, the ball signal gets injected into the loop. The 2 neurons in the loop keep the signal alive even after the bird leaves the ball. Then the signal is reversed (repel from the ball instead of attract to it) and passed to the wings.
    Don’t want the birds to keep going up forever, just want them to go high enough to clear wall #2. This means the memory of hitting the ball has to decay. A sidetrip out through the 1/2 neuron does this. To keep the signal from decaying too quickly, more connections are added between the 2 memory neurons. This dilutes the effect of the 1/2.

     If the bounce signal has to fight against the down signal, the birds move too slowly. To prevent the bounce from having to fight the down signal like this, a bunch of parts of the bounce circuit send suppression signals to the down-and-left circuit.
    Tuning
    Once the birds are moving in a nice down-up-down motion, it took some tuning to get them to just barely clear wall #2 before going back down to the 3rd pill.
    Tuning #1: The memory decays slower if there are more connections between the 2 memory neurons (this dilutes the effect of the 1/2 signal). About 5 connections in each direction worked well.
    Tuning #2: The suppression lines are doubled in a few places to suppress the down signal even more.

  • BirdBrain Puzzle

    Hello Internet. I have a puzzle for you. It’s quite hard.

    In this puzzle you have to build the brain of a bird. The brain already has several Neurons, you need to connect them with some Axons.

    The puzzle is here: BirdBrain

    Don’t run off though! You need some instructions and I happen to have some hastily written instructions right here:

    Controls: Click on a Neuron (the grey disks), drag to a different Neuron and let the button go. This will make a wire between the two Neurons.

    Click on a wire to delete it.

    You want to make the stream of birds pass through each yellow “food”. If you get one dot then you’ve figured out how to play. If you get the second dot then you are clever indeed. The third one is genuinesly hard, I really doubt you’ll make it there so why stress about it?

    There are Three broad catagories of Neurons and Nine specific kinds.

    The Three catagories are:

    1. Input
    2. Processing
    3. Output

    These correspond to the top row, the two middle rows, and the bottom row of the puzzle. The top rows generate directional input, the middle rows can change that input, and the final row takes whatever is being fed into it and steers the bird in that direction.

    Here is a run-down of all the neuron types:

    This Neuron points towards the red baloon. But, and this is important, only if the bird is touching it. The bird is blind, it can’t see the baloon, it can only feel it.

     

    Up/Down/Left/Right: These Neurons point in one direction at all times no matter what. Try conecting one of these neurons to the final “motor neuron”.

     

    These are your basic normal Neurons. They average whatever input they get. If you pass them a down and a right you will get down-and-right out of it.

     

    This reverses whatever you pass in. If you pass it a down and a right you will get up-and-left out of it.

     

    Will average whatever input it gets and then multiply by two on the way out. If you pass it down and right you will get down-and-right-but-fast out.

     

    Will average whatever input it gets and then divide by two on the way out. If you pass it down and right you will get down-and-right-but-slow out.

     

    This is the birds wings. It will fly in whatever direction you like. If you pass it down and right then the bird will fly down and right.

     

    Wires: are used to connect Neurons. Information flows along the wires in the direction you draw them. If you draw from the Left Neuron to the Motor Neuron your birds will go left. If you drag from the Motor Neuron to the Left Neuron the bird will not move.

    Inhibiting Wires: These wires inhibit whatever they are connected to acoriding to the strength of the information passing along them. If you connect the Down Neuron to the Motor Neuron with a normal wire and then the Left Neuron to the Motor Neuron with an Inhibiting wire the bird will not move because the Motor Neuron is being inhibited with the strength of the Left Neuron.

    Loops: You can make loops.

    Overlapping Wires: You can place a wire between the same two Neurons as many times as you want going in either or both directions. There is no graphical hint to tell you how many wires are there.

    Special Case: Neurons average all the information they get except for the special case of zeros. If they get a zero they will simply ignore it. Since the birds can not see the Baloon when they start connecting the Balloon Neuron to anything will have no immediate effect because it is sending no information. Combining anything with no information results in no change, not a halving of the value.

    Good luck. You’re going to need it. (and yes, it is possible, here is a picture of my birds getting to the end)

    If you’d rather just mess about in a sandbox I have one of those here.