December 2025 - Winter Wonder Series

Dropdown Menu

Radio Button

Checkbox

Snackbar

Stateful vs. Stateless Composables

State Hoisting in Compose

Managing State in Jetpack Compose (Codelab)

Standard Android / Jetpack libraries.

Use Material 3 components or simple custom UI elements.

No 3rd party libraries are allowed or would be required to complete this challenge

Responsiveness across every device size or orientation is not mandatory.

Data persistence after closing the app.

Light/Dark mode support.

A successful submission of this challenge via the /submit-challenge command on Discord grants you 100 XP. You can use it in any channel on Discord :)

A successful submission consists of these parts

1. A link to a Gist with your implementation

2. A screen recording (max 20 seconds) showing:

   • The initial empty form.

   • Selecting Gift Type and Delivery Method.

   • “Place Order” button becoming active.

   • Snackbar with message “Your order has been placed!”.

SoundPool

Full Guide to Jetpack Compose Animations

Quick Guide to Animations in Compose

Standard Android / Jetpack libraries.

Use Material 3 components or simple custom UI elements.

No 3rd party libraries are allowed or would be required to complete this challenge

Responsiveness across every device size or orientation is not mandatory.

Visual effects such as shadows or depth.

Light/Dark mode support.

A successful submission of this challenge via the /submit-challenge command on Discord grants you 100 XP. You can use it in any channel on Discord :)

A successful submission consists of these parts

1. A link to a Gist showing your code for this challenge.

2. A screen recording (max 20 seconds) showing:

   • Initial screen in landscape orientation.

   • Pressing several keys.

   • Smooth color change animation.

   • Corresponding sound playback.

Sensors Overview

Motion sensors

Full Guide to Jetpack Compose Animations

Quick Guide to Animations in Compose

Value-based Animations

Jetpack Compose Animation Codelab

Standard Android / Jetpack libraries.

Use Material 3 components or simple custom UI elements.

No 3rd party libraries are allowed or would be required to complete this challenge

Responsiveness across every device size or orientation is not mandatory.

Realistic physics or turbulence of snowflakes.

Interaction with objects inside the globe.

Light/Dark mode support.

A successful submission of this challenge via the /submit-challenge command on Discord grants you 100 XP. You can use it in any channel on Discord :)

A successful submission consists of these parts

1. A link to a Gist showing your code for this challenge.

2. A screen recording (max 20 seconds) showing:

   • The idle state (no snow).

   • Device shaking triggering snowfall.

   • Snowflakes falling vertically inside the globe.

   • The globe returning to the calm state.

Luhn algorithm

Luhn algorithm Wiki

Visual Transformation

Configure text fields

Create a notification with a snackbar

Stateful vs. Stateless Composables

State Hoisting in Compose

Managing State in Jetpack Compose (Codelab)

Standard Android / Jetpack libraries.

Use Material 3 components or simple custom UI elements.

No 3rd party libraries are allowed or would be required to complete this challenge

Responsiveness across every device size or orientation is not mandatory.

Actual card linking or network communication.

State persistence after closing the screen.

Light/Dark mode support.

A successful submission of this challenge via the /submit-challenge command on Discord grants you 200 XP. You can use it in any channel on Discord :)

A successful submission consists of these parts

1. A link to a Gist showing your code for this challenge.

2. A screen recording (max 20 seconds) showing:

   • Initial state (empty field, disabled button).

   • Typing or pasting a random invalid number → shows red border + “Invalid card number”.

   • Entering the valid test card number 4242 4242 4242 4242 → button activates.

   • Press Activate → 2s loading → “Holiday Cashback Activated!” Snackbar → button text changes to Done.

   • Press Done → all fields reset to the initial state.

Enable user interactions

Text in Compose

Style text

Annotated String

Configure text fields

Stateful vs. Stateless Composables

State Hoisting in Compose

Managing State in Jetpack Compose (Codelab)

Standard Android / Jetpack libraries.

Use Material 3 components or simple custom UI elements.

No 3rd party libraries are allowed or would be required to complete this challenge

Responsiveness across every device size or orientation is not mandatory.

Implementing actual functionality for the Share button

Real file saving or history of edits.

Animated theme transitions.

Light/Dark mode support.

A successful submission of this challenge via the /submit-challenge command on Discord grants you 300 XP. You can use it in any channel on Discord :)

A successful submission consists of these parts

1. A link to a Gist showing your code for this challenge.

2. A screen recording (max 20 seconds) showing:

   • The initial screen with Golden Eve theme and the placeholder.

   • Switch the theme from Golden Eve → Snowy Night.

   • Type two text parts:

   • Title: Let It Snow!

     • Message: May your holidays be filled with smiles.

   • Edit the title:

   • Change font size to Large.

     • Switch font to PT Serif.

     • Apply bold, italic, and underline.

     • Change the text color to Warm Beige (#F7E6C7).

   • Press Reset — the title returns to default formatting.