fxgl-idle-clicker

name	fxgl-idle-clicker
description	Build an incremental idle or clicker game in FXGL — click for resources, buy auto-producers, scale costs exponentially, show passive income in the HUD, unlock upgrades by milestones, calculate capped offline progress on load, format very large numbers, and implement prestige resets with permanent bonuses.
triggers	["idle game","clicker","incremental","passive income","offline progress","prestige","big number formatting","auto producer"]
compatibility	Java 17+, FXGL 21.x. Pairs naturally with fxgl-save-load, fxgl-progression, and fxgl-ui-scenes.
category	fxgl/game-types
tags	["fxgl","java","javafx","game-types","idle","clicker"]
metadata	{"author":"fxgl-skills","version":"1.0","fxgl-version":"21.1"}
allowed-tools	["Read","Write","Edit","Bash"]

FXGL Idle / Clicker Game

Core Variables

@Override
protected void initGameVars(Map<String, Object> vars) {
    vars.put("coins", 0.0);
    vars.put("clickValue", 1.0);
    vars.put("passivePerSecond", 0.0);
    vars.put("prestigeBonus", 1.0);
}

Track producers separately in a model rather than scattering values across many globals.

public record Producer(String id, double baseRate, double baseCost, IntegerProperty owned) {
    public double currentCost() {
        return baseCost * Math.pow(1.15, owned.get());
    }
}

Click Loop

private void onMainClick() {
    double gain = getd("clickValue") * getd("prestigeBonus");
    set("coins", getd("coins") + gain);
}

Bind the main click to a large button or main resource sprite in initUI().

Passive Income

private final List<Producer> producers = List.of(
        new Producer("cursor", 0.2, ,  ()),
         (, , ,  ()),
         (, , ,  ())
);


   {
    run(() -> {
        set(, getd() + getd());
    }, Duration.seconds());
}

   {
       producers.stream()
            .mapToDouble(p -> p.owned().get() * p.baseRate())
            .sum();

    set(, rate * getd());
}