Python Challenge

Feed your brain. Grow the snake.

Learn algorithms by writing real Python — on your phone.

Python Challenge is a single path of original coding challenges, from your first `return a + b` to N-Queens, edit distance and Dijkstra. Every solution runs on-device in real Python and is checked against hidden tests, so passing means it actually works.

WRITE REAL CODE
• A coder keyboard built for Python: tab, snippets, brackets, quotes, undo
• Instant feedback with named tests, expected vs actual output
• Some levels enforce rules (no sorted(), recursion required) so you learn the technique, not the shortcut

LEARN THE RIGHT WAY
• Three-tier hints from PySnake, your slightly sardonic mentor
• Curated solutions after you solve: naive vs optimal, time and space complexity
• Topics: strings, lists, sorting, searching, recursion, dynamic programming, data structures, graphs, heaps, bit tricks, grids, greedy, intervals, math

STAY MOTIVATED
• One path, no shortcuts: easy → medium → hard, with performance tests on the hard ones
• XP, levels, daily streaks and ten badges
• Six themes, dark and light

PRIVATE BY DESIGN
• Works fully offline, no account, no ads, no tracking — your code and progress stay on your device. Only anonymous usage statistics are sent.