Three ways to play the same book. Climb the platformer and answer to refuel.
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← → to move, Space to jump, ↓ + Space to drop through. Use the on-screen controls to run and jump. Orbs ask a question; a correct answer refuels the climb.
The mindmap
Every key idea of the book, mapped. Unlock it branch by branch as you answer.
Every key idea of the book, mapped. Unlock it branch by branch as you answer.
Some of the core ideas
What's inside
74 maps, 366 characters and 1246 questions, all generated from the book.
Forest of Biological Themes
Core concepts and themes unifying the study of biology
5 characters · 17 questions
Trailhead of Scientific Process
How scientists form hypotheses and test them
5 characters · 17 questions
Molecular Building Blocks Cave
Atoms, elements, and bonds forming life's molecules
5 characters · 17 questions
Ocean of Water Properties
Water's unique properties essential to life
5 characters · 17 questions
Biological Molecules Ruins
Carbohydrates, lipids, proteins, and nucleic acids
5 characters · 17 questions
Microscope Cavern
Techniques for studying cells and their structures
5 characters · 17 questions
Prokaryote vs Eukaryote Desert
Comparing simple and complex cell types
5 characters · 17 questions
Eukaryotic Organelle Castle
Structures and functions within eukaryotic cells
5 characters · 17 questions
Cell Membrane Barrier Reef
Structure and function of the plasma membrane
5 characters · 17 questions
Passive Transport Currents
Diffusion and osmosis across membranes
5 characters · 17 questions
Active Transport Fortress
Energy-driven movement of substances across membranes
5 characters · 17 questions
Energy and Metabolism Volcano
How cells capture, store, and use energy
5 characters · 17 questions
Glycolysis Caverns
Breaking down glucose for energy
5 characters · 17 questions
Citric Acid Cycle Forge
Oxidative phosphorylation and the Krebs cycle
5 characters · 17 questions
Fermentation Swamp
Anaerobic energy production pathways
5 characters · 17 questions
Metabolic Pathway Crossroads
Connections between metabolic pathways
5 characters · 17 questions
Photosynthesis Overview Grove
Introduction to how plants capture light energy
5 characters · 17 questions
Light Reaction Sunpeaks
Light-dependent reactions of photosynthesis
5 characters · 17 questions
Calvin Cycle Meadow
Carbon fixation and sugar synthesis
5 characters · 17 questions
Genome Vault
Organization of genetic material in organisms
5 characters · 17 questions
Cell Cycle Clocktower
Phases and regulation of the cell cycle
5 characters · 17 questions
Cancer and Cell Cycle Ruins
How cell cycle breakdown leads to cancer
5 characters · 17 questions
Prokaryotic Division Desert
Binary fission in prokaryotic cells
5 characters · 17 questions
Sexual Reproduction Sanctuary
Advantages and mechanisms of sexual reproduction
5 characters · 17 questions
Meiosis Ice Caverns
Chromosome reduction during gamete formation
5 characters · 17 questions
Meiotic Error Crevasse
Consequences of mistakes during meiosis
5 characters · 17 questions
Mendel's Garden
Classic pea plant inheritance experiments
5 characters · 17 questions
Laws of Inheritance Castle
Fundamental rules governing trait inheritance
5 characters · 17 questions
Inheritance Extensions Ruins
Exceptions and complexities beyond Mendel's laws
5 characters · 17 questions
DNA Structure Caverns
The double helix and its components
5 characters · 17 questions
DNA Replication Forge
How DNA copies itself before division
5 characters · 17 questions
Transcription Temple
Converting DNA into messenger RNA
5 characters · 17 questions
Translation Workshop
Building proteins from RNA instructions
5 characters · 17 questions
Gene Regulation Labyrinth
Controls determining gene expression
5 characters · 17 questions
Cloning and Engineering Lab Ruins
Techniques for manipulating genetic material
5 characters · 17 questions
Biotech Fields of Medicine
Applications of biotechnology in health and farming
5 characters · 17 questions
Genomics and Proteomics Observatory
Large-scale study of genomes and proteins
5 characters · 17 questions
Homeostasis Oasis
Maintaining internal balance and osmoregulation
5 characters · 17 questions
Digestive System Depths
Breakdown and absorption of nutrients
5 characters · 17 questions
Circulatory and Respiratory Straits
Blood flow and gas exchange systems
5 characters · 17 questions
Endocrine System Spire
Hormonal regulation of body functions
5 characters · 17 questions
Musculoskeletal Fortress
Bones and muscles enabling movement
5 characters · 17 questions
Nervous System Circuits
Neural signaling throughout the body
5 characters · 17 questions
Viral Invasion Ruins
Structure and life cycle of viruses
5 characters · 17 questions
Innate Immunity Bastion
Body's first-line defenses against pathogens
5 characters · 17 questions
Adaptive Immunity Citadel
Specific immune responses and memory
5 characters · 17 questions
Immune Disruption Wastes
Disorders and failures of the immune system
5 characters · 17 questions
Animal Reproduction Lagoon
Diverse strategies for reproducing offspring
5 characters · 17 questions
Development and Organogenesis Grove
Formation of organs during development
5 characters · 17 questions
Human Reproduction Sanctum
Human-specific reproductive biology
5 characters · 17 questions
Animal Form and Function Peaks
General principles of animal body design
5 characters · 17 questions
Primary Tissue Catacombs
Four basic tissue types in animals
5 characters · 17 questions
Homeostasis Ice Fields
Regulatory mechanisms maintaining stability
5 characters · 17 questions
Digestive System Deep Caves
Comparative digestive system structures
5 characters · 17 questions
Nutrition and Energy Production Plains
Nutrient use for energy and growth
5 characters · 17 questions
Digestive Processes Canyon
Mechanical and chemical digestion steps
5 characters · 17 questions
Digestive Regulation Tower
Hormonal control of digestion
5 characters · 17 questions
Neurons and Glia Grotto
Cell types composing the nervous system
5 characters · 17 questions
Neural Communication Lightning Peaks
Electrical and chemical signaling between neurons
5 characters · 17 questions
Central Nervous System Keep
Brain and spinal cord structure and function
5 characters · 17 questions
Peripheral Nervous System Pathways
Nerves connecting CNS to the body
5 characters · 17 questions
Nervous Disorder Ruins
Diseases and dysfunctions of the nervous system
5 characters · 17 questions
Sensory Processing Overlook
General principles of sensory perception
5 characters · 17 questions
Somatosensation Caverns
Touch, pain, and body sensation pathways
5 characters · 17 questions
Taste and Smell Oasis
Chemical senses of gustation and olfaction
5 characters · 17 questions
Hearing Ocean Depths
Mechanisms of auditory perception
5 characters · 17 questions
Vision Crystal Caves
Mechanisms of visual perception
5 characters · 17 questions
Blood Composition Reef
Components and functions of blood
5 characters · 17 questions
Gas Exchange Volcanic Vents
Partial pressures and alveolar gas exchange
5 characters · 17 questions
Respiratory Quotient Ridge
Metabolic fuel use and CO2/O2 ratios
5 characters · 17 questions
Disease and Pathogen Ruins
Causes and spread of disease
5 characters · 17 questions
Hormonal Signaling Spire
Chemical messengers coordinating body systems
5 characters · 17 questions
Cellular Respiration Summary Volcano
Integrating respiration pathways for ATP yield
5 characters · 17 questions
Genetic Variation Highlands
Sources of variation from meiosis and mutation
1 characters · 5 questions
How the book becomes practice
Reading puts ideas in. Retrieval keeps them there. The game is the retrieval.
Walk the world of the book
74 maps, one per part of the book. Signs along the way hold its key ideas, so the walk itself is a refresher.
Battle the characters
366 characters, each a short quiz on one idea. Answer well and the map opens up; a boss guards the end of each one.
Missed ideas come back
Every question you get wrong is re-asked in rematches and boss fights, and the Flashcards mode schedules it with spaced repetition, until you get it right.
Keep what you learn
Sign up for free and your demo progress, XP, best tower stage and flashcard schedules move to your account. Come back whenever a chapter starts to fade.