The Chrome offline dinosaur game, recreated from its source
T-Rex Runner
Same speeds, same jump, same gaps, same scoring and night sky as the game hidden in Chrome — with original pixel art. Free, no sign-in, plays in the browser.
Nothing to load. Time to run.
Press Space or ↑ to jump and ↓ to duck. On a phone, tap the dinosaur to jump.
DINO_READY_TO_RUN
How to play
- Start. Press Space or the Up arrow (or tap the dinosaur). The T-Rex jumps in place, the stage opens to its full width and the ground starts to move. Three seconds later the first cactus arrives.
- Jump. Space or Up. Holding the key gives the full jump; releasing it once the T-Rex has risen 30 pixels cuts the jump short. Down while in the air drops you three times faster.
- Duck. Hold Down to run low under a pterodactyl. You cannot jump while ducking. On a phone, hold the Duck button.
- Speed. The run starts at speed 6 and gains 0.001 every frame, up to 13. Cactus groups of two and three appear once the speed allows (4 for small, 7 for large); pterodactyls need 8.5.
- Score. One point per 40 pixels of ground. Every 100 points the counter flashes; every 700 points night falls for twelve seconds. HI is your best.
- Game over. Enter or a tap restarts at once; Space and Up work again after 1.2 seconds. Tap HI twice to reset the high score.
What is replicated
- The 600 by 150 stage, 60 Hz time-based stepping, start speed 6, acceleration 0.001 per frame, top speed 13.
- Jump velocity -10 minus a tenth of the speed, gravity 0.6, the 30-pixel minimum jump, the -5 drop on release, the x3 speed drop on Down, the duck.
- The idle T-Rex that blinks three times and then waits; the intro that opens the stage on the first landing; three seconds before the first obstacle.
- Small cacti 17 x 35 and large cacti 25 x 50 in groups of up to three; pterodactyls 46 x 40 at three heights (two on phones), 0.8 faster or slower than the ground, flapping six times a second.
- The gap formula: width x speed + 120 x 0.6, up to 1.5 times that; never three of the same obstacle in a row.
- Collision per body part with the original's boxes, trimmed by the one-pixel border.
- The five-digit counter (six past 99,999), 0.025 points per pixel, the flashing achievement every 100 with its sound.
- Night every 700 points for 12 seconds: seven moon phases in order, two stars, the whole page inverting.
- Clouds 46 x 14 at a fifth of the speed, at most six; flat and bumpy ground segments chosen at random.
- GAME OVER and the restart button that draws itself in after a pause; restart on Enter or a tap at once, on Space after 1.2 seconds.
- The slow "accessibility" speed mode (4.2 to 9, softer jump) and gamepad buttons A, B and Start.
- Pause when the tab loses focus, resume when it returns.
Additions of this page, not in the original: the course number in the link (the same number replays the same obstacles), the sound, dark-theme and arcade-mode buttons, the hold-to-duck button on touch screens, statistics, the high score kept in this browser, and a paused game surviving a reload. The art and sounds are original; see CREDITS.txt.
Keyboard
| Space / ↑ | Start, jump; restart 1.2 s after a crash | ↓ | Duck; drop faster while jumping |
|---|---|---|---|
| Enter | Restart after a crash | Esc | Leave arcade mode, close a dialog |
| F1 | Help | Gamepad | A jumps, B ducks, Start restarts |
Questions
How do I play T-Rex Runner?
Press Space or the Up arrow to start and to jump; press Down to duck, or to drop faster while in the air. On a touch screen, tap the dinosaur to jump and hold the Duck button to duck. Avoid the cacti and pterodactyls; the run ends on the first hit.
How is the score counted?
The score is distance: every 40 pixels of ground scrolled past is one point (0.025 points per pixel), so it climbs faster as the game speeds up from 6 to 13. Every 100 points the digits flash three times and a chime plays. HI shows the best score kept in this browser.
When do the pterodactyls appear and why does it get dark?
Pterodactyls only appear once the speed reaches 8.5 (around 350 to 450 points) and fly at three heights: duck under the middle one, jump the low one, run under the high one. Night falls at every multiple of 700 points, lasts twelve seconds and shows the moon in a new phase each time.
How do I restart after a crash?
Press Enter or tap the game to restart at once; Space and the Up arrow restart after a 1.2 second pause, as in the original, so a mistimed jump does not skip the game-over screen. Tap the HI score twice on the game-over screen to reset it.
What is the number in the link?
The number after the # is this page's course seed: the same number produces the same sequence of cacti, pterodactyls, gaps and clouds, so two people can race the same course. That is an addition of this page; the original game is random every time.
Is this the real Chrome game, and is anything sent anywhere?
It is an independent recreation. The rules and every constant were taken from the Chromium project's open source code, but the artwork, sounds, text and code here are original. It is not affiliated with Google. Your options, high score and statistics stay in this browser; the page makes no network calls of its own.