Unit Converter
Create a handy tool for converting temperature, weight, time, or distance.
OverTheWire Wargames
Learn and practice hacking/security concepts in the form of fun-filled games.
VIM Adventures
An online game for learning how to use the vim text editor.
SQL Murder Mystery
Can you find out whodunnit?
Screeps
MMO sandbox game for programmers
Regex Crossword
A crossword puzzle game, where the crossword clues are defined using regular expressions.
CSS Diner
Learn and practice CSS selectors in an interactive game.
Yoda Speak
Translate plain old English into Yoda's way of speaking.
Tower of Hanoi
Code a solver for this famous puzzle using recursion.
Timer
Create a useful tool for toothbrushing, cooking, and more!
Sudoku Solver
Write a program to solve Sudoku puzzles.
Snake
Create your own version of this popular game.
Pong
Create your own version of this popular game.
Palindrome checker
Enjoy word puzzles? This one might be fun for you!
Number Pyramid
Write a program to display a symmetrical pyramid of numbers.
Number Guessing Game
Play this simple game against a friend or the computer.
md5 cracker
Write a program to decrypt this common hashing algorithm.
Joke Bot
Have some good jokes? Make a bot to tell them! Or, get some jokes from an API.
Insertion Sort
Sharpen your skills by coding this simple sorting algorithm.
Hangman (or Snowman)
Put your own spin on this classic word game.
Flappy Bird
This popular game is always a fun time. Put your own spin on it!
Fibonacci Sequence
This simple number sequence has a lot to offer coders, from simple iteration to recursion and dynamic programming.
Dice Roller
Need to roll some dice? Write a program for that!
Coin Toss
Need to flip a coin? Write a program for that!
Chinese Zodiac Calendar
Display each animal sign and tell people which sign they are.
Cellular Automaton
A fun way to create interesting patterns based on simple rules.
Calculator
Create a basic or advanced calculator.
Caesar Cipher
Create encrypted messages using this simple cipher.
Bubble Sort
Sharpen your skills by coding this simple sorting algorithm.
Binary Birthday Game
Guess a person's birthday using only 5 binary bits.
Tic-Tac-Toe
Here is a shorter description.