Education
5,614 pages · most loved first · page 155 of 234· Tonble one of these
Putting the You in CPU
A free illustrated mini-book explaining what actually happens inside a CPU and operating system when you run a program.
Puzzle Baron's Logic Puzzles
A vast library of printable and browser-playable logic grid puzzles with adjustable difficulty and a leaderboard for com…
Puzzle Bridges
A free browser implementation of Hashiwokakero, the pencil puzzle where numbered islands must be connected by a set numb…
Puzzle Kakuro
A free browser implementation of Kakuro, the crossword-shaped number puzzle where digits in each run must sum to the giv…
Puzzle Light Up
A free browser implementation of Light Up (Akari), the pencil puzzle where placing light bulbs on a grid must illuminate…
Puzzle Madness
A free British puzzle site offering a wide variety of word searches, logic grids, and number puzzles across difficulty l…
Puzzle Shikaku
A free browser implementation of Shikaku, the pencil puzzle where a grid must be divided into rectangles each containing…
Puzzle Star Battle
A free browser implementation of Star Battle, the pencil puzzle where stars must be placed on a grid so that no two touc…
Puzzlecanon
A close look at puzzle canons, the enigmatic riddle-like compositions by Bach and others where the score hides how the m…
Puzzled Pint
The archive of a free monthly in-person puzzle hunt held in cities worldwide, with every past month's cooperative logic…
Puzzlewocky: Situation Puzzles
A curated set of lateral-thinking situation puzzles, the kind solved by asking yes-or-no questions, presented with clear…
Puzzling Stack Exchange
A question-and-answer community where thousands of original logic puzzles, riddles, and lateral-thinking brain teasers a…
pwn.college
A hands-on cybersecurity education platform with lectures and practice challenges that teach hacking skills from the bas…
PyKidos
A browser-based Python playground for children where short programs draw emoji and colors, saved locally with no account…
Pyramid Scheme
Watch population pyramids for every country morph year by year from 1950 to 2100, as overlaid 2D curves or a stacked 3D…
PyRun
A free browser-based Python IDE powered by WebAssembly that runs entirely offline, with numpy, pandas, and matplotlib an…
Pytheas Center for Contemporary Music
A web nexus for modern non-pop art music, with composer profiles, ensembles, performance listings and resources for expl…
Python Data Science Handbook
The full text of Jake VanderPlas's handbook, with Jupyter notebooks on IPython, NumPy, Pandas, Matplotlib, and Scikit-Le…
Python for Everybody
A free course for learning Python from scratch, with lessons, exercises, and materials that take beginners from basic sy…
Python Tutor
A free tool that visualizes code execution step by step, drawing variables and data structures as you run Python, JavaSc…
QED
A short interactive text on propositional logic by Terence Tao, arranged like a computer game with sections and exercise…
QEDCat
The site of mathematicians Burkard Polster and Marty Ross, packed with playful recreational math articles, videos, and p…
Q-PATHS
An interactive web tool that builds visual intuition for quantum entanglement, walking through the basic quantum terms w…
QR is cool
An interactive demo of QR code error correction: pick or scan a code, then scribble on it or cover parts and see it stil…
Stumble onto more like this
One click takes you to a page you didn't know you were looking for. Rate it and the next one lands closer to your taste.
Add to Browser — it's freeWorks in Chrome, Edge and Brave. No account needed.