Unity Challenges

Real coding challenges for game developers.

Easy challenges are free. No trial.

Total challenges: 100
Free challenges: 33
Completed: 0

Starter path 5 quick exercises

Optional warm-up. The full free library is below.

100 challenges

Daily Practice

Add Two Vector3 Values
vectors / math
easyFreeStart challenge
Normalize Movement Input
vectors / movement
easyFreeStart
Raycast Detection
raycast / ground
easyFreeStart
Jump Calculator
physics / math
easyFreeStart
Normalized Direction Vectors
daily-challenge / movement_math
easyFreeStart
Basic Target Following with Vector Direction
daily-challenge / movement_math
easyFreeStart
Constant Velocity Platformer Movement
daily-challenge / movement_math
easyFreeStart
Constant Velocity Platformer Movement
daily-challenge / movement_math
easyFreeStart
Smooth Camera Follow with Lerp
camera / lerp
mediumProView Pro
Angle Between Vectors
vectors / angles
mediumProView Pro
Smooth Camera Follow
camera / lerp
mediumProView Pro
Jump Arc Calculation
physics / jump
mediumProView Pro
Path Smoothing
interpolation / curves
mediumProView Pro
HLSL-based Procedural Movement Shader Challenge
HLSL / Unity
mediumProView Pro
Projectile Arc Trajectory Predictor
daily-challenge / movement_math
mediumProView Pro
Projectile Arc Trajectory Calculation
daily-challenge / movement_math
mediumProView Pro
Predictive Projectile Trajectory Calculation
daily-challenge / movement_math
mediumProView Pro
Pathfinding Distance
pathfinding / math
hardProView Pro
Projectile Trajectory
physics / trajectory
hardProView Pro
Projectile Arc
physics / ballistics
hardProView Pro
Projectile Trajectory
physics / trajectory
hardProView Pro
Predictive Projectile Interception
daily-challenge / movement_math
hardProView Pro
Projectile Prediction with Quadratic Drag
daily-challenge / movement_math
hardProView Pro
Predictive Projectile Interception
daily-challenge / movement_math
hardProView Pro
Predictive Projectile Trajectory Calculation
daily-challenge / movement_math
hardProView Pro

Clamp Player Health
health / gameplay
easyFreeStart
Cooldown Manager
cooldown / abilities
easyFreeStart
Damage Over Time System
DOT / damage
easyFreeStart
Combo Counter
combo / timing
easyFreeStart
Health Bar Smoothing
UI / animation
easyFreeStart
S — Single Responsibility: Refactor the Bloated PlayerController
SOLID / SRP
easyFreeStart
Implementing a Simple Cooldown System
daily-challenge / gameplay_systems
easyFreeStart
Implementing a Simple Experience Points System
daily-challenge / gameplay_systems
easyFreeStart
Implement Cooldown Timer
gameplay / timers
mediumProView Pro
Damage Over Time System
gameplay / timers
mediumProView Pro
Implement a Timer System
timer / gameplay
mediumProView Pro
Inventory System - Add/Remove Items
inventory / collections
mediumProView Pro
Inventory Stack
inventory / stacking
mediumProView Pro
Cooldown Manager
cooldown / abilities
mediumProView Pro
Inventory System
inventory / dictionary
mediumProView Pro
Enemy Spawn Manager
spawning / waves
mediumProView Pro
O — Open/Closed: Extensible Weapon Damage System
SOLID / OCP
mediumProView Pro
L — Liskov Substitution: Fix the Broken Enemy Hierarchy
SOLID / LSP
mediumProView Pro
I — Interface Segregation: Split the Fat IUnit Interface
SOLID / ISP
mediumProView Pro
Achievement System Manager
daily-challenge / gameplay
mediumProView Pro
Grid Pathfinding
AI / pathfinding
hardProView Pro
D — Dependency Inversion: Inject the Logger into GameManager
SOLID / DIP
hardProView Pro
Optimized Spatial Hashing for Dynamic Proximity Triggers
daily-challenge / gameplay_systems
hardProView Pro
Optimized Spatial Trigger System
daily-challenge / gameplay_systems
hardProView Pro

Door State Machine
state-machine / FSM
easyFreeStart
Simple Enemy Patrol State Machine
daily-challenge / unity
easyFreeStart
Simple Finite State Machine
fsm / ai
mediumProView Pro
Simple AI Patrol
AI / patrol
mediumProView Pro
Quest State Manager
quest / state-machine
mediumProView Pro
Implementing a Patrol State Machine
daily-challenge / state_machines
mediumProView Pro
Implementing a Finite State Machine for an Enemy Patrol AI
daily-challenge / state_machines
mediumProView Pro
Implementing a Finite State Machine for an Enemy Patrol
daily-challenge / state_machines
mediumProView Pro
Implementing a FSM-based Enemy Guard
daily-challenge / state_machines
mediumProView Pro
Implementing a Finite State Machine for an Enemy Patrol AI
daily-challenge / state_machines
mediumProView Pro
Implementing a FSM-based Enemy Guard
daily-challenge / state_machines
mediumProView Pro
Player State Machine
FSM / states
hardProView Pro
State Machine Transitions
FSM / states
hardProView Pro

Optimizing Frequent Component Access
daily-challenge / performance
easyFreeStart
Efficient Tag-Based Cleanup
daily-challenge / performance
easyFreeStart
Optimizing Frequent Component Access
daily-challenge / unity
easyFreeStart
Optimizing Frequent Component Lookups
daily-challenge / performance
easyFreeStart
Efficient Tag-Based Component Access
daily-challenge / performance
easyFreeStart
Object Pooling
optimization / pooling
mediumProView Pro
Circular Buffer
buffer / data-structures
mediumProView Pro
Optimizing Object Spawning with Object Pooling
daily-challenge / performance
mediumProView Pro
Optimizing Object Spawning with Object Pooling
daily-challenge / performance
mediumProView Pro
Object Pooling
optimization / pooling
hardProView Pro
Object Pooling System
performance / pooling
hardProView Pro
Object Pool Optimization
pooling / optimization
hardProView Pro
Data-Oriented Particle System Optimization
daily-challenge / performance
hardProView Pro
High-Performance Object Pooling for Massive Projectile Systems
daily-challenge / performance
hardProView Pro
High-Performance Object Pooling for Massive Projectile Systems
daily-challenge / performance
hardProView Pro
Data-Oriented Particle System Optimization
daily-challenge / performance
hardProView Pro

Find the Bug: Null Reference
debugging / null
easyFreeStart
Find Bug: Health Regeneration
debugging / health
easyFreeStart
Find Bug: Velocity Clamping
debugging / velocity
easyFreeStart
Find Bug: Distance Check
debugging / distance
easyFreeStart
Find Bug: Score Multiplier
debugging / score
easyFreeStart
Null Reference Bug Hunt
debugging / null-reference
easyFreeStart
Fix the Player Health UI Bug
daily-challenge / debugging
easyFreeStart
Fix the Player Speed Multiplier
daily-challenge / debugging
easyFreeStart
Debug the Speed Boost Utility
daily-challenge / debugging
easyFreeStart
Fix the Player Speed Multiplier
daily-challenge / debugging
easyFreeStart
Find Bug: Timer Countdown
debugging / timer
mediumProView Pro
Find Bug: Damage Calculation
debugging / combat
mediumProView Pro
Find Bug: Rotation Lerp
debugging / rotation
mediumProView Pro
Find Bug: Attack Cooldown
debugging / cooldown
mediumProView Pro
Fixing the Persistent Coroutine Bug
daily-challenge / unity
mediumProView Pro
Fixing the Persistent Coroutine Memory Leak
daily-challenge / debugging
mediumProView Pro
Find Bug: Array Bounds
debugging / arrays
hardProView Pro
Fixing the Circular Dependency and Race Condition in Object Pooling
daily-challenge / debugging
hardProView Pro
Fixing the Circular Memory Leak in Object Pooling
daily-challenge / debugging
hardProView Pro
Optimizing The Ghost Entity Component System
daily-challenge / debugging
hardProView Pro
Fixing the Persistent Object Pooling Leak
daily-challenge / debugging
hardProView Pro
Fixing the Circular Reference Memory Leak
daily-challenge / csharp
hardProView Pro

Starter path 5 quick exercises

Movement & MathVectors, movement, and physics math.25 challenges

Add Two Vector3 Values

Normalize Movement Input

Raycast Detection

Jump Calculator

Normalized Direction Vectors

Basic Target Following with Vector Direction

Constant Velocity Platformer Movement

Constant Velocity Platformer Movement

Smooth Camera Follow with Lerp

Angle Between Vectors

Smooth Camera Follow

Jump Arc Calculation

Path Smoothing

HLSL-based Procedural Movement Shader Challenge

Projectile Arc Trajectory Predictor

Projectile Arc Trajectory Calculation

Predictive Projectile Trajectory Calculation

Pathfinding Distance

Projectile Trajectory

Projectile Arc

Projectile Trajectory

Predictive Projectile Interception

Projectile Prediction with Quadratic Drag

Predictive Projectile Interception

Predictive Projectile Trajectory Calculation

Gameplay SystemsHealth, timers, and core gameplay logic.24 challenges

Clamp Player Health

Cooldown Manager

Damage Over Time System

Combo Counter

Health Bar Smoothing

S — Single Responsibility: Refactor the Bloated PlayerController

Implementing a Simple Cooldown System

Implementing a Simple Experience Points System

Implement Cooldown Timer

Damage Over Time System

Implement a Timer System

Inventory System - Add/Remove Items

Inventory Stack

Cooldown Manager

Inventory System

Enemy Spawn Manager

O — Open/Closed: Extensible Weapon Damage System

L — Liskov Substitution: Fix the Broken Enemy Hierarchy

I — Interface Segregation: Split the Fat IUnit Interface

Achievement System Manager

Grid Pathfinding

D — Dependency Inversion: Inject the Logger into GameManager

Optimized Spatial Hashing for Dynamic Proximity Triggers

Optimized Spatial Trigger System

State MachinesStates, transitions, and game behavior.13 challenges

Door State Machine

Simple Enemy Patrol State Machine

Simple Finite State Machine

Simple AI Patrol

Quest State Manager

Implementing a Patrol State Machine

Implementing a Finite State Machine for an Enemy Patrol AI

Implementing a Finite State Machine for an Enemy Patrol

Implementing a FSM-based Enemy Guard

Implementing a Finite State Machine for an Enemy Patrol AI

Implementing a FSM-based Enemy Guard

Player State Machine

State Machine Transitions

PerformanceEfficient code for real-time games.16 challenges

Optimizing Frequent Component Access

Efficient Tag-Based Cleanup

Optimizing Frequent Component Access

Optimizing Frequent Component Lookups

Efficient Tag-Based Component Access

Object Pooling

Circular Buffer

Optimizing Object Spawning with Object Pooling

Optimizing Object Spawning with Object Pooling

Object Pooling

Object Pooling System

Object Pool Optimization

Data-Oriented Particle System Optimization