2-Player: Start 2-player match Create online lobby Player 1 Player 2 · Host online Join online How? Two tabs of this browser, or an online lobby with a link to share; each player controls a ship

Scenes: [1]Twin Paradox [2]Barn & Pole [3]Terrell–Penrose Street [4]Einstein Train Sync [5]Relativistic Carousel [6]Billiards (Dynamic) Drag canvas to look around · WASD/Space/C to thrust

Spacetime: [G]View Mode [M]Render Mode [H]Shadow Mode [/]Light Flash [Enter]Fire [\]Ammo [PgDn]Prophecy −Δ [PgUp]Prophecy +Δ [V]Match Velocity [X]Brake (Lab Frame) [P]Pause [T]Rewind [-]Slower [=]Faster [Scrub −t ]Scrub +t [F]GPU/CPU [Z]1X/2X Res [R]Reset [Tab]HUD

Thrust: WForward SBack ALeft DRight SpaceUp CDown Hold to accelerate (proper acceleration in your own frame)

Teleport: IForward KBack JLeft LRight UUp ODown Hold to shift position at fixed coordinate time t