Geektastic!

A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.

Duel with friends and foes in head-to-head programming battles!

Coderbyte is a place built for anyone to practice and perfect their programming skills. Challenges are added almost every day so you can work on applying your algorithmic thought process on any problem you want at anytime. Coderbyte is built on improving your ability to work on common logic, mathematical, and algorithmic problems you might one day encounter.

CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics.

CheckiO is expanding the world’s code literacy through gameplay.

Achieve code mastery through challenge.Improve your skills by training with others on real code challenges

CodeEval is platform for hosting coding challenges which has over 20,000+ competitive developers.

CodeChef was created by Directi as a way to continuously challenge and engage the developer community. Our goals are to provide a platform for practice, competition and improvement as well as enable developers to benchmark their skills against their peers. We’re having fun with the site and hope you will too.

VIM Adventures is an online game based on VIM's keyboard shortcuts (commands, motions and operators). It's the "Zelda meets text editing" game. It's a puzzle game for practicing and memorizing VIM commands (good old VI is also covered, of course). It's an easy way to learn VIM without a steep learning curve.You play a blinking cursor appearing one day in a semi text based world of Textland inhabited by little people but ruled by bugs. You soon discover that your arrival was foretold by an old prophecy and that you're expected to restore order to the world (in case you didn't make it to level 2 yet...). »

Topcoder gathers the world’s experts in design, development and data science to work on interesting and challenging problems. Members are provided with opportunities to demonstrate their expertise, improve their skills, and win cash, while helping real world organizations solve real world problems.

The programmer testing solution that matches your job descriptions and helps you hire great developers faster.

Businesses are run by people. It is the quality of the people that work at any given workplace that determines the success/failure of that particular company. So, how do you ensure that you have the best people working with you at all times? By taking a page out of the book that is Interact, and ditching the traditional interviewing process.

Create your interview or use our templates for FREE. Interview as many candidates as you want for FREE. See candidates' answers and scores for FREE.

Screeps is a massive multiplayer online real-time strategy game. Each player can create his or her own colony in a single persistent world shared by all the players. Such a colony can mine resources, build units, conquer territory. As you conquer more territory, your influence in the game world grows, as well as your abilities to expand your footprint. However, it requires a lot of effort on your part, since multiple players may aim at the same territory.