Physics Playground 2.0 is rebuilt from scratch. 63 new hands-on games replace the old quizzes, with brand new graphics, stars, badges and Free Play. Built for iPhone Duo: aim the cannon with the hinge, play across both halves or on the outer screen. Your progress and badges carry over.

• Every topic is now in Spotlight, and Siri can explain one at your reading level without opening the app. • Ask Siri to open a playground by name. • Your reading level now sticks between launches. It used to quietly reset to Teen every time the app started.

What's New in Version 1.0.2 This update is all about making the interactive simulations and mini-games more reliable. Every interactive experience in the app was tested and the issues below were fixed. Crash fixes - Fixed a crash in the Cellular Respiration mini-game that could happen when you tapped Skip before placing a stage. - Fixed a crash that could occur when opening the CRISPR mini-game. Achievement badges now save correctly - Fixed an issue where finishing certain games did not actually save your badge, so it showed as locked again later. This affected games across Chemistry, Math, Computer Science, and Philosophy, including Drug Design, Green Chemistry, Catalysis, Materials Science, Nanochemistry, Polymers, Supramolecular Chemistry, Astrochemistry, Analytical Chemistry, Organometallic Chemistry, Databases, Differential Geometry, Limits, Vector Calculus, and Philosophy of Physics. Your badges and overall completion now record properly. Controls that now work as expected - Data Structures and AlphaFold: the Pause button now freezes the animation in place instead of snapping it back to the start. - Organic Chemistry: the Skip button now moves you to a new molecule instead of showing the same one. - Computer Graphics: your coverage match score now stays on screen after you submit. - Turing Machines: a wrong answer now lets you adjust a rule and run again on the same puzzle, matching the on screen instructions. - Scheduling and Concurrency: losing a round now lets you rebalance and try again instead of ending the game early. - Cybersecurity: levels now play in the correct order, with no skipped or repeated levels. Display and accuracy fixes - Stoichiometry and Microbiome: the results screen now shows the round you just played instead of jumping ahead to the next one. - Machine Learning: the misclassified point markers now match the reported accuracy. - Geometry: the rectangle round now always shows four distinct answer choices. - Measure Theory and Organometallic Chemistry: corrected button labels that appeared one round early. Thanks for playing and learning. More improvements are on the way.

A brand new Computer Science subject joins Physics, Math, Biology, and Chemistry. Explore 29 topics across Theory, Systems & Engineering, and Applications & AI, including Turing machines, the halting problem, algorithms, cryptography, compilers, operating systems, networks, machine learning, computer vision, robotics, and more. We also rounded out the existing subjects with the topics you've been asking for: Physics: Nuclear Physics, Dark Matter & Dark Energy, Quantum Field Theory, Astrophysics & Cosmology, and Philosophy of Physics. Math: Number Theory, Combinatorics, Group Theory, Set Theory & Logic, Game Theory, Optimization, Fractals, Differential Geometry, Vector Calculus, Numerical Analysis, Measure Theory, and Dynamical Systems. Chemistry: Electrochemical Cells, Analytical Chemistry, Materials Science, Inorganic Chemistry, and Organometallic Chemistry. Every new topic comes with its own hands on visualization and a custom mini game built to make the idea click. Improvements: We polished 40 existing games to be more fun and more accurate, with real science fixes along the way. The subject picker is now horizontally scrollable and keeps your current subject in view. Thanks for learning with us. More to come!