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Lab Lockdown: a Praxis General Science (5436) study game
You're locked in a science building. The only way out is to use the science. Lab Lockdown is a 3D escape room you play in your browser, built to help you review the content of the Praxis General Science: Content Knowledge (5436) test by putting it to work.
▶ Play the Chem Lab free
Features
- Six escape rooms: chemistry lab, greenhouse, observatory, seismology station, physics workshop and field station.
- In-world locks: 3D keypads, letter-wheel locks and dial safes. No quiz pop-ups.
- Hidden clues: notes scattered around each room, including invisible ink that only shows under the UV flashlight and fine print that needs the magnifier.
- Progressive hints that end in a worked explanation, plus a "why this works" note after every solve.
- A built-in notebook with formulas, a glossary and review notes, and a calculator.
- Star ratings and collectible element cards to track your progress.
What the 5436 test covers, and how the rooms map to it
The official ETS Praxis General Science: Content Knowledge (5436) Study Companion organizes the test into four content categories: Nature and Impact of Science and Engineering, Physical Science, Life Science, and Earth and Space Science. See the Study Companion on ets.org for the full, current specifications. Each room in Lab Lockdown mixes topics from these categories:
| Room | Main categories | Topics you'll use |
|---|---|---|
| The Chemistry Lab (free demo) | Physical Science, Nature of Science | Acids and stoichiometry, dilution, atomic structure, Ohm's law circuits, gas laws, and lab safety. |
| The Greenhouse | Life Science | Cell organelles, meiosis, Mendelian genetics, Hardy–Weinberg, photosynthesis, photon energy, osmosis. |
| The Observatory | Earth & Space Science | The solar system, orbits and Kepler's laws, stars, light and gravity. |
| The Seismology Station | Earth & Space Science | Earthquakes and epicenters, minerals, radiometric dating, plate tectonics. |
| The Physics Workshop | Physical Science | Circuits and power, energy, waves, heat. |
| The Field Station | Life Science, Earth Science, Nature of Science | Ecology, water quality, pH, populations, data and experimental design. |
How to play
- Click Play, choose a room, and click to look around. Move with WASD and the mouse.
- Press E to inspect objects and read the notes you find. Clues go into your notebook (N).
- Pick up tools and switch between them with 1–5. The UV flashlight reveals hidden writing.
- Work out the answer, then enter it on the lock itself. Press buttons, turn wheels and pull levers.
- Stuck? Ask for a hint from the close-up view. Fewer hints earn more stars.
FAQ
What is Lab Lockdown?
A free-to-try 3D escape room game in your browser. You review general science content by solving physical puzzles across six themed rooms.
Is it made by or endorsed by ETS?
No. Lab Lockdown is an independent study game. Praxis is a registered trademark of ETS, and ETS has not endorsed or approved this game.
Which topics does it cover?
The rooms are mapped to the four content categories listed in the official Praxis General Science: Content Knowledge (5436) Study Companion: Nature and Impact of Science and Engineering; Physical Science; Life Science; and Earth and Space Science.
Is it free?
The Chemistry Lab room is a free demo. During our testing period, all six rooms are open.
Does it replace official prep materials?
No. Use it alongside the official ETS Study Companion and practice tests. The game is for active review and practice.
What do I need to play?
A desktop or laptop with a modern browser, plus a keyboard and mouse. Your progress is saved in your browser.