Pixel House Idle / Offline Rewards – Extension for GDevelop
Hi everyone! 
I recently created a new GDevelop extension for idle, tycoon, production, farming and management games:
Pixel House Idle / Offline Rewards
The basic idea is very simple:
Create something that produces a resource over time – and let the extension handle the time calculation, even while the game is closed.
Simple example
Imagine your game has a quarry:
Quarry → 100 Stone per day
The player closes the game and comes back 3 days later.
The quarry has produced:
300 Stone
No timers need to keep running in the background. The extension calculates the elapsed real-world time when the player returns.
Every producer has its own timer
This was one of the main reasons I created the extension.
For example:
Taxi 1 is purchased at 12:00
Taxi 2 is purchased at 15:00
Both earn $300 per hour.
If the player returns at 18:00:
Taxi 1 → $1,800
Taxi 2 → $900
Each producer has its own independent timestamp, so newly purchased producers don’t receive rewards for time before they existed.
What is a “Producer”?
Basically, anything you want!
Taxi → Money
Quarry → Stone
Lumber Mill → Wood
Farm → Crops
Chicken Coop → Eggs
Factory → Products
Mine → Ore
Solar Panel → Energy
The extension only calculates a number, so you decide what that number represents.
Upgrades are possible too
Let’s say your quarry produces:
100 Stone per day
The player assigns another worker to it.
Simply change its income to:
200 Stone per day
The reward already accumulated before the upgrade is preserved.
Pause & Resume
Individual producers can also be paused.
For example, if a machine is switched off:
Pause Producer “Machine_01”
Its current reward is preserved, but it stops producing.
Later:
Resume Producer “Machine_01”
Production continues from that moment. The time spent paused is not counted.
The pause state is persistent as well, so closing and reopening the game won’t accidentally generate rewards for a paused producer.
Main features
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Independent timer for every producer
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Offline progress while the game is closed
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Money, resources, crops, materials, energy, etc.
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Individual and total reward calculation
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Claim individual rewards or all rewards
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Change production rates at runtime
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Pause & resume individual producers
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Maximum offline time
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Reset and remove producers
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Conditions for producer/reward states
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Expressions for rewards, elapsed time, income and intervals
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Persistent saved producer data
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Commented GDevelop example project included
No JavaScript knowledge is required to use it.
I originally created this after a request for an idle tycoon system where every purchased vehicle needed its own independent offline timer, but while developing it I realized the same system can be useful for many other types of games too.
I hope some of you find it useful! 
Pixel House Idle / Offline Rewards v1.0.1