CodeItRaw · Don't memorize code. Watch it.

Write Python, JavaScript, TypeScript, C++ or SQL; run it, pause it, rewind it. Watch what every line does, step by step, in a live world.

Play now, no sign-up

How it works

Scroll and the code runs. The lit line is the one running now, the bot is its result, and the strip below is the whole run.

Write
Read the sensors, decide, steer the bot.
Run
The code runs once; every line is recorded.
Rewind
Go back in time to the moment the bug was born.

step 1 / 25

1def solve(bot, radar):×0
2    while not bot.at_target():×1
3        if radar.front_blocked():×0
4            bot.turn_right()×0
5        else:×0
6            bot.move()×0

The commands in this example unlock as you go; the first level has only bot.move().

Guide a robot through mazes, repair faulty code, query a database, race your friends live. Python, JavaScript, TypeScript, C, C++ and SQL; all of it runs in your browser.

01InfiltrationGuide a bot through mazes with conditions and loops. Hidden maps catch memorised answers. The basics track for newcomers to programming.

02Code DuelOne data problem, two players. Your operation count is measured on growing inputs: O(n) tears down the O(n²) castle. An asynchronous race against a rival's verified solution.

03Code ReadingUnderstand code without writing it: hunt the bug, predict the output, review AI solutions, read the Big-O. The skill interviews and code reviews lean on most.

04DatabaseWrite queries against a real SQL database: solve a data leak with door logs, file access and VPN logins. Your query is tried on hidden datasets too.

05WebDraw the target exactly with HTML and CSS. Your drawing sits live over the target and the pixels that differ light up red.

06Terminal & GitType commands in a real shell: files, pipes, grep; then branches, merges and conflicts with Git. The commit graph draws live and every step can be rewound.

07ClashOpen a room and call your friends: everyone solves the same level at the same time. The level stays hidden until the race starts; the room's mode decides who wins.

Every level is also tested on hidden maps. Code tailored to one map gets caught, efficient code gets measured.