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