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