Infection

There is a disease outbreak! Will you find patient zero?!?

Infection is a distributed game which simulates the propagation of an illness. The goal is to stop the outbreak before every player dies!

Number of players: 1 Master, 4 or more players. Each Master and players need a micro:bit with battery pack.

In this game, a master micro:bit infects a “patient zero” player with the sickness. The infected player will be contagious immediately but won’t show any sign during the incubation time. The sickness gets transmitted when two micro:bit get close to each other. After the incubation period, the sad face will appear on the screen. After the sickness period, the player will eventually die and a skull will display on the screen. Dead players are out of the game.

If any player survives the outbreak, the game is won. Otherwise try again!

Infection is an engaging game that will get your students running around. We recommend playing it outside to give more space for the students.

How to play

Press A+B to enter master mode (1 per game).

Wait for players to be paired. The number of paired player will display on screen. A letter will appear on the player’s screen, this letter is the player’s identity.

Once all your players are registered, press A+B to start the infection game. The game will pick a random player as patient zero.

A player will transmit the disease if close enough (RSSI) and with a certain probability (TRANSMISSIONPROB). During the incudation phase (INCUBATION), the player does not show any sign of illness (happy face). After that phase, the player gets sick and shows a sad face on the screen. After the sick face, the player dies and a skull shows up.

Once the game is over, the micro:bit will show the player id (A,B,C…), health and who infected him. The master micro:bit will show the identity of patient zero.

Icons used in the game:

Pairing: IconNames.Ghost
Paired: IconNames.Happy
Dead: IconNames.Skull
Sick: IconNames.Sad
Incubating: IconNames.Confused
Healthy: IconNames.Happy

https://makecode.microbit.org/_gymCJCWPbiDu

JavaScript code

/**
 * Infection game
 * 
 * Flash all micro:bit will this script
 * 
 * Press A+B to enter master mode (1 per game)
 *
 * Wait for players to be paired. The number of paired player will display on screen.
 * An icon will appear on player's screen.
 * 
 * Press A+B to start the infection game. The master will pick a random
 * player as patient zero.
 *
 * A player will transmit the disease if close enough (RSSI)
 * and with a certain probability (TRANSMISSIONPROB). 
 * During the incudation phase (INCUBATION), the player does not show any sign 
 * of illness. After that phase, the sad face shows up.
 * 
 * The game will automatically stop once all players are dead or healthy. The master can
 * also press A+B again to stop the game.
 * 
 * Once the game is over, the micro:bit will show the player id (A,B,C...), health and 
 * who infected him.
 * 
 * Icons used in the game:
 * 
 * Pairing: IconNames.Ghost
 * Paired: IconNames.Happy
 * Dead: IconNames.Skull
 * Sick: IconNames.Sad
 * Incubating: IconNames.Confused
 * Healthy: IconNames.Happy
 * 
 */
const INCUBATION = 20000; // time before showing symptoms
const DEATH = 40000; // time before dying off the disease
const RSSI = -45; // db
const TRANSMISSIONPROB = 40; // % probability to transfer disease

enum GameState {
    Stopped,
    Pairing,
    Running,
    Over
}

enum HealthState {
    Healthy,
    Incubating,
    Sick,
    Dead
}

const GameIcons = {
    Pairing: IconNames.Ghost,
    Paired: IconNames.Happy,
    Dead: IconNames.Skull,
    Sick: IconNames.Sad,
    Incubating: IconNames.Confused,
    Healthy: IconNames.Happy
}

const playerIcons = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
class Player {
    id: number;
    icon: number;
    health: HealthState;
    show() {
        basic.showString(playerIcons[this.icon]);
    }
}

// common state
let state = GameState.Stopped;

// master state
let master = false;
let patientZero: Player;
const players: Player[] = [];

// player state
let paired = false;
let infectedBy = -1; // who infected (playerIcon)
let infectedTime = 0; // local time when infection happened
let playerIcon = -1; // player icon and identity
let health = HealthState.Healthy;

// get a player instance (creates one as needed)
function player(id: number): Player {
    for (const p of players)
        if (p.id == id) return p;

    // add player to game
    let p = new Player();
    p.id = id;
    p.icon = (players.length + 1) % playerIcons.length;
    p.health = HealthState.Healthy;
    players.push(p);
    serial.writeLine(`player ==> ${p.id}`)

    return p;
}

function allDead(): boolean {
    for (const p of players)
        if (p.health != HealthState.Dead) return false;
    return true;
}

function gameOver() {
    state = GameState.Over;
    if (patientZero)
        patientZero.show();
}

function gameFace() {
    switch (state) {
        case GameState.Stopped:
            basic.showIcon(GameIcons.Pairing);
            break;
        case GameState.Pairing:
            if (playerIcon > -1)
                basic.showString(playerIcons[playerIcon]);
            else
                basic.showIcon(paired ? GameIcons.Paired : GameIcons.Pairing, 1);
            break;
        case GameState.Running:
            switch (health) {
                case HealthState.Dead:
                    basic.showIcon(GameIcons.Dead, 1);
                    break;
                case HealthState.Sick:
                    basic.showIcon(GameIcons.Sick, 1);
                    break;
                default:
                    basic.showIcon(GameIcons.Healthy, 1);
                    break;
            }
            break;
        case GameState.Over:
            // show id
            basic.showString(playerIcons[playerIcon]);
            basic.pause(2000);
            // show health
            switch (health) {
                case HealthState.Dead:
                    basic.showIcon(GameIcons.Dead, 2000);
                    break;
                case HealthState.Sick:
                    basic.showIcon(GameIcons.Sick, 2000);
                    break;
                case HealthState.Incubating:
                    basic.showIcon(GameIcons.Incubating, 2000);
                    break;
                default:
                    basic.showIcon(GameIcons.Healthy, 2000);
                    break;
            }
            // show how infected
            if (infectedBy > -1) {
                basic.showString(" INFECTED BY");
                basic.showString(playerIcons[infectedBy]);
                basic.pause(2000);
            } else {
                basic.showString(" PATIENT ZERO");
                basic.pause(2000);
            }
            // show score
            game.showScore();
            basic.pause(1000);
            break;
    }
}

// master button controller
input.onButtonPressed(Button.AB, () => {
    // register as master
    if (state == GameState.Stopped && !master) {
        master = true;
        paired = true;
        state = GameState.Pairing;
        serial.writeLine("registered as master");
        radio.setTransmitPower(7); // beef up master signal
        basic.showString("0");
        return;
    }

    if (!master) return; // master only beyond this

    // launch game
    if (state == GameState.Pairing) {
        // pick 1 player and infect him
        patientZero = players[Math.random(players.length)];
        while (patientZero.health == HealthState.Healthy) {
            radio.sendValue("infect", patientZero.id);
            basic.pause(100);
        }

        // all ready
        state = GameState.Running;
        serial.writeLine(`game started ${players.length} players`);

        // show startup
        basic.showIcon(GameIcons.Dead);
    } // end game 
    else if (state == GameState.Running) {
        gameOver();
    }
})

radio.setGroup(42);
radio.setTransmitSerialNumber(true)
radio.onDataPacketReceived(({ time, receivedNumber, receivedString, signal, serial: id }) => {
    if (master) {
        if (receivedString == "pair") {
            // register player
            let n = players.length;
            let p = player(id);
            // show player number if changed
            if (n != players.length) {
                led.stopAnimation();
                basic.showNumber(players.length);
            }
        }
        else if (receivedString == "health") {
            let p = player(id);
            p.health = receivedNumber;
            // check if all infected
            if (allDead())
                gameOver();
        }
    } else {
        if (receivedString == "state") {
            // update game state
            state = receivedNumber as GameState;
        } else if (infectedBy < 0 &&
            receivedString == "infect"
            && receivedNumber == control.deviceSerialNumber()) {
            // infected by master
            infectedBy = 0; // infected my master
            infectedTime = input.runningTime();
            health = HealthState.Incubating;
            serial.writeLine(`infected ${control.deviceSerialNumber()}`);
        }
        if (receivedString == "h" + control.deviceSerialNumber().toString() &&
            health < receivedNumber) {
            health = receivedNumber;
        }
        switch (state) {
            case GameState.Pairing:
                // medium range in pairing mode
                if (!paired &&
                    receivedString == "paired"
                    && receivedNumber == control.deviceSerialNumber()) {
                    // paired!
                    serial.writeLine(`player paired ==> ${control.deviceSerialNumber()}`)
                    paired = true;
                    return;
                }
                else if (paired && receivedString == "i" + control.deviceSerialNumber().toString()) {
                    playerIcon = receivedNumber;
                }
                break;
            case GameState.Running:
                // broadcast infection status
                if (health == HealthState.Healthy && receivedString == "transmit") {
                    serial.writeLine(`signal: ${signal}`);
                    if (signal > RSSI &&
                        Math.random(100) > TRANSMISSIONPROB) {
                        infectedBy = receivedNumber;
                        infectedTime = input.runningTime();
                        health = HealthState.Incubating;
                    }
                } else if (health != HealthState.Dead
                    && receivedString == "health" && signal > RSSI) {
                    game.addScore(1);
                }
                break;
        }
    }
})

// main game loop
basic.forever(() => {
    if (master) {
        switch (state) {
            case GameState.Pairing:
                // tell each player they are registered
                for (const p of players) {
                    radio.sendValue("paired", p.id);
                    radio.sendValue("i" + p.id, p.icon);
                }
                serial.writeLine(`pairing ${players.length} players`);
                basic.pause(500);
                break;
            case GameState.Running:
                for (const p of players) {
                    radio.sendValue("h" + p.id, p.health);
                }
                break;
            case GameState.Over:
                if (patientZero)
                    patientZero.show();
                break;
        }
        radio.sendValue("state", state); // keep broadcasting the game state
    } else { // player loop
        switch (state) {
            case GameState.Pairing:
                // broadcast player id
                if (playerIcon < 0)
                    radio.sendValue("pair", control.deviceSerialNumber());
                else if (infectedBy > -1)
                    radio.sendValue("health", health);
                break;
            case GameState.Running:
                // update health status
                if (health != HealthState.Healthy && input.runningTime() - infectedTime > DEATH)
                    health = HealthState.Dead;
                else if (health != HealthState.Healthy && input.runningTime() - infectedTime > INCUBATION)
                    health = HealthState.Sick;
                // transmit disease
                if (health == HealthState.Incubating || health == HealthState.Sick)
                    radio.sendValue("transmit", playerIcon);
                radio.sendValue("health", health);
                break;
        }
        // show current animation
        gameFace();
    }
})


basic.showIcon(GameIcons.Pairing)

radio