0 km/h
▲0%
0 m
🪙 0
🪿 0
C
S
🚲
CHECK POINT
🐌
TOO SLOW!
Pedal: alternate ← and →
Steer: A / D
🎁 Grab presents for a speed BOOST
Pull back · aim · let go
ROAD AHEAD — CALL IT
BOOST!
CRANK FIGHT!Same foot, same moment — alternate!
Match your partner’s beat with the opposite foot
▲
▼
Left Pedal
Right Pedal
▲
Left Pedal
Right Pedal
▼
▲
Left Pedal
Right Pedal
▼

Tap to Start

This browser can’t run Tandemonium

Try Chrome, Edge or Safari 16.4+, or update your phone’s software. On a desktop browser it should just work.


  





) boots like the desktop app:
  // "Press any button to start", dismissed by a remote key or a pad button.
  var isTV = !isDesktop && !!window.__tandemoniumTV;
  // Mirror config.js isMobile so the boot veil label agrees with the app.
  var isMobile = !isDesktop && !isTV && (/Android|iPhone|iPad|iPod|webOS|BlackBerry|IEMobile|Opera Mini/i.test(ua) || navigator.maxTouchPoints > 1);
  // Desktop (Electron) and mobile both show a "Loading…" veil instead of the
  // "Tap to Start" prompt: desktop dismisses on gamepad input (poll below),
  // mobile auto-dismisses once the Lobby loads (the tap-gate is obsolete — iOS
  // motion permission is requested from a real gesture at ride start). Desktop
  // *browsers* keep the click-to-start prompt (they need the click to dismiss).
  var textEl = document.getElementById('tap-to-start-text');
  if (isDesktop || isTV || isMobile) {
    // #162: name the thing that is loading, and keep the progress bar visible.
    if (textEl) textEl.textContent = 'Loading Tandemonium…';
  } else if (textEl && !navigator.maxTouchPoints) {
    // #263: a desktop browser has no touchscreen — "Tap to Start" is the wrong
    // word, and the click is only there to unlock audio. Say what to do.
    textEl.textContent = 'Click to start';
  }
  if (isDesktop || isTV) {
    // Poll for gamepad input to dismiss the overlay
    var overlay = document.getElementById('tap-to-start');
    // #428 · 16: once the game has booted, the veil is waiting on the player,
    // not on loading, so say so. A key press dismisses it too.
    var readyPoll = setInterval(function () {
      if (!overlay.isConnected) { clearInterval(readyPoll); return; }
      if (!window._game) return;
      clearInterval(readyPoll);
      if (textEl) textEl.textContent = 'Press any button to start';
      window.addEventListener('keydown', function onKey() {
        window.removeEventListener('keydown', onKey);
        if (overlay.isConnected) overlay.click();
      });
    }, 150);
    function pollForButton() {
      var gamepads = navigator.getGamepads ? navigator.getGamepads() : [];
      for (var i = 0; i < gamepads.length; i++) {
        var gp = gamepads[i];
        if (!gp) continue;
        // Check if any button is pressed
        for (var b = 0; b < gp.buttons.length; b++) {
          if (gp.buttons[b].pressed) {
            // Dismiss — the Lobby's _dismissTapOverlay will handle the rest
            overlay.click();
            return;
          }
        }
        // Check if any stick is moved significantly
        for (var a = 0; a < gp.axes.length; a++) {
          if (Math.abs(gp.axes[a]) > 0.5) {
            overlay.click();
            return;
          }
        }
      }
      requestAnimationFrame(pollForButton);
    }
    requestAnimationFrame(pollForButton);
  }
})();





  

    
  

  Tandemonium
  
Party Physics Game on a Tandem Bicycle

  

  

    

    

      
      

        
        
        
        
        
        

          
          

            

            

            

            
            
            
            
          

          
          
          
          
        

      


      
      

        
        

        
        
          

            RIDE TOGETHER
            SOLO RIDE
            
            
            Don’t see your controller? Pair it
            
            
            📱 Phone as controller
          

        

        
        
          
Where are you two?

          

            
            
            
            
            

            

            PLAN THE RIDE
          

          ← Back
        

        
        
          
          
          
          

          ← Back
        

        
        
          
Choose your seat:

          START A RIDE
Captain · Front seat
          JOIN A RIDE
Stoker · Back seat
          
          
          ← Back
        

        
        
          
Local versus

          
          

            
            
VS

            
          

          
          
          

          
 on a controller to join ·  switch team ·  wardrobe ·  leave your seat

          
          
          Don’t see your controller? Pair it
          📱 Use your phone as a controller
          
          CHOOSE LEVEL
          ← Back
        

        
        
          
Your room code:

          
----

          

          

          
Long-press URL or QR code to copy link

          

          CHOOSE LEVEL
          
          
          
Scan to join
Scan with a phone, then choose: steer from it while the game stays on this screen, or play on the phone itself.

          
          Join from another device with a code
          

            
Local multiplayer
Two controllers on this screen, one bike.

            
              
              
            
            
            
            

            CHOOSE LEVEL
          

          
          
          
          ← Back
        

        
        
          
          
          
Enter room code:

          

            TNDM
            -
            
          

          
          
          
          

            
Join a ride

            
Enter the code on the captain’s screen.

            
            
          

          JOIN
          

          ← Back
        



        
      


      
      

        

          
          
          
        

        

          

            
            

              
Keyboard only!

            

          

          

            
            

              
Motion Steering

              

                Stable
                
                Responsive
              

              
              
            

          

          

            
            

              
              
              
              
            

          

        

      

    

    
    
    
    
    
    
    
    
Users First (Games)   v.60224d8 | 11-07-2026 14:12 (PR #642)  

  

  Tandemonium Actions
  
  
  
  

  
  
    
    Help 
    
    
    
    
    0 of 100
    Profile
    Controls
    
    
    
    
  

  
  
    
    
    
    
      
Steering feel StableResponsiveRecalibrate

    
    
    
    
DONE

  

  
  
    
Close the game and go back to the desktop.

    
QUITCANCEL

  





  

    

    

    

  





  

    

  





  

  
  
P1 · Buzz a controller

  

    
    
  





  





  

    
Tandemonium

    
A party-physics game on a tandem bicycle. Ride solo or with a partner — pedal, steer, and navigate to your destination before time runs out!


    

      
Toggles

      

        
        Leaderboard — View top scores for the current level
      

      

        
        Profile — Sign in with Discord to save scores everywhere you play
      

      

        ALL
        All — Turn motion steering and music on or off together
      

      

        
        Joystick — Steer with gamepad left stick (appears when controller connected)
      

      

        
        Controller Gyro — Lean controller to steer. Click a stick (L3 or R3) to recalibrate
      

      

        
        Phone Motion — Tilt your phone to steer. Tap screen to recalibrate
      

      

        
        Music — Toggle background music on/off
      

      

        ?
        Help — This help screen
      

    


    

      
Learn to Ride

      
Practice pedaling and steering with any input. The tutorial adapts to your active controller:

      

        ⌨️
        Keyboard — Steer with A/D. Pedal with Left/Right arrows
      

      

        🕹️
        Joystick — Steer with left stick. Pedal with L1/R1 or L2/R2. Both together to brake
      

      

        🎮
        Controller Gyro — Lean to steer. Pedal with L1/R1 or L2/R2. Both together to brake. Click a stick (L3 or R3) to recalibrate
      

      

        📲
        Use your phone as a controller — Choose 📱 Phone as controller and scan the code: tilt to steer, tap the pedals to ride
      

      

        📱
        Phone Motion — Tilt to steer. Tap the left and right pedals to ride. Both together to brake. Tap center to recalibrate
      

    


    

      
Attributions

      

        "Tandem bicycle"
        by Sameer.Rayeen — licensed under
        CC BY 4.0.
      

      

        "Krampus Workshop" by Kevin MacLeod
        (incompetech.com)
        — licensed under
        CC BY 4.0.
      

      

        Goose calls (goose-honk.mp3) by
        freesound_community
        via Pixabay
        — Pixabay Content License (attribution not required; credited with thanks).
      

      

        Thanks to The Central Ohio GameDev Group
        — for inspiration, friendship, and fun.
      

      

        Immersive audio design based on the taxonomy in
        “A Taxonomy for Immersive Audio Techniques in Video Game Sound Design”
        by Alex Sallade
        (sallade.5@osu.edu,
        Ph.D. dissertation, The Ohio State University, 2024).
      

    


  







  
  

    
    
    
  

  
  
  






  

  

    

    

  




 SKIP TUTORIAL


  

  

  

     START
     SKIP TUTORIAL
  




  

  

    RESUME
    RESTART
    SETTINGS
    END RIDE
  

  
  

    SAFETY 
    AUTO SPEED 
    ASSIST 
    SAVE CLIP
  

  

     Help
  




  
    
    
    
    
  




  
🎁

  
COLLECT




✅


← Stay on the road! →



  
Oops! Try again

  





  
  
  

  

    
Steering Feel

    

      Stable
      
      Responsive
    

  

  
  
  

    
    Let's RIDE!
  

  









  
  
    

      

        
        
      

      

        

        

        
        
      

      
      
      
      
    

    
    

      
      PLAY AGAIN
      
      END RIDE TOGETHER
      
      
      
      
    

  





























🎮





  

    
Settings

    
    

      
Graphics Quality

      

        
        
        
        
      

      
Some changes take effect on next restart

    

    

      
Gyro Steering

      

        
        
      

      
Controller gyro only — applies immediately

    

    

      
Show Riders

      

        
        
      

      
Canadian-goose riders + front camera — applies immediately

    

    

      
Show Solo

      

        
        
      

      
Solo rides show one goose (the captain) — applies immediately

    

    
    

      
Player 1's Goose

      

        
        
      

      
Your goose's body — other players pick theirs in the Wardrobe on the seat screen

    

    

      
Player 1's Outfit

      

        
        
        
        
        
      

      
What your goose wears — applies immediately

    

    

      
Player 1's Colours

      

        
        
        
        
      

      
Colour changes for the chosen outfit (saved per outfit) — applies immediately

    

    

      
FPS Display

      

        
        
      

      
Frame-rate readout, all modes — applies immediately

    

    
    

      
      
      
    

    

      
Crash Physics

      

        
        
      

      
Tumbling crashes, knocked pylons, goose strikes — next ride

    

    
    

      
Display Testing — overrides

      
Overrides on top of Graphics Quality, for testing a TV or slow screen. The page reloads to apply.

    

    

      
Render lines

      

        
        
        
        
      

    

    

      
Edge smoothing

      

        
        
        
      

    

    

      
Perf readout

      

        
        
      

    

    

      
Reset overrides