One tandem bike. Two riders. Total pandemonium. Coordinate pedaling and balance with a friend over the network — or brave it solo. Physics-driven courses, 7 named bikes, 19 achievement badges, and leaderboards that know if you're a better Captain or Stoker.
[h2]One Bike. Two Seats. Zero Chill.[/h2]
Tandemonium is a physics party game about riding a tandem bicycle — the kind with two seats, shared pedals, and absolutely no room for disagreement.
Ride solo if you want a challenge. Ride together if you want chaos.
[h2]How It Works[/h2]
Two players connect over the network. Each gets their own screen. One is the [b]Captain[/b] (front seat — steering and balance). The other is the [b]Stoker[/b] (back seat — pedaling power and lean).
The catch? Real tandem bikes have their pedals offset 180 degrees. When the Captain pushes down, the Stoker's pedals come up. Coordinate your rhythm for maximum speed. Fall out of sync and you're fighting your own bike.
Lean too far? The bike tips. Hit 77 degrees and it's over. Unless you somehow recover — which is half the fun.
[h2]The Courses[/h2]
[b]Grandma's House[/b]
"Grandma called — she needs her presents!"
A short, sweet sprint through the countryside. Collect presents along the way. Sounds easy. It isn't.
[b]The Castle[/b]
"The King awaits! Collect gems on the road to glory!"
The long haul. Gems to collect and plenty of chances to wipe out spectacularly.
[h2]Pick Your Ride[/h2]
Choose from 7 named bikes, each with its own color and personality:
[list]
[*] [b]Old Faithful[/b] — The classic. No frills, all heart.
[*] [b]Marmalade Express[/b] — Bold orange for bold riders.
[*] [b]Berry Blaster[/b] — Magenta and unapologetic.
[*] [b]Cherry Bomb[/b] — Red, fast, and a little reckless.
[*] [b]Ocean Breeze[/b] — Cool blue. Calm exterior. Chaotic interior.
[*] [b]Jungle Cruiser[/b] — Green and built for adventure.
[*] [b]Banana Split[/b] — Yellow. Ridiculous. Perfect.
[/list]
Your choice shows up on the actual 3D bike. Choose wisely — or don't.
[h2]19 Achievement Badges[/h2]
Earn badges across distance, speed, cooperation, mastery, and exploration:
[list]
[*] [b]Distance milestones[/b] — First 500m, 1K Club, 5K Champion
[*] [b]Speed[/b] — Speed Demon (hit 50 km/h)
[*] [b]Cooperation[/b] — Perfect Sync (10 seconds of coordinated pedaling), Team Player
[*] [b]Collection[/b] — Collector, Hoarder (grab every collectible in a level)
[*] [b]Level completion[/b] — Home Sweet Home, Royal Arrival
[*] [b]Bike + level combos[/b] — Marmalade Delivery, Berry Special Visit, Cherry on Top, Ocean to Grandma's, Jungle Express, Banana Delivery, Grandma's Classic
[*] [b]Flawless rides[/b] — Flawless 1K, Untouchable (no crashes on The Castle)
[/list]
Earned badges orbit your avatar during gameplay. Your partner sees them. They're wearable bragging rights.
[h2]Leaderboards That Tell a Story[/h2]
Four tabs. Four ways to compete.
[list]
[*] [b]Solo[/b] — Your time against the world, no excuses.
[*] [b]Together[/b] — How fast can your duo finish? Cooperative rankings.
[*] [b]Partner[/b] — Find your next riding partner. See who's been riding.
[*] [b]You[/b] — Your personal ride history. Every attempt, every time, every role.
[/list]
Every leaderboard entry shows whether you rode as Captain, Stoker, or Solo. Filter by level. See who's actually the fastest on Grandma's House vs The Castle.
[h2]See Your Partner. See Them Pedal. Hear the Panic![/h2]
Built-in video and voice chat. Watch your partner's face as the bike starts tipping. Hear the exact moment they realize you're both going down. Save the clip.
[h2]Features[/h2]
[list]
[*] Physics-based tandem bicycle with realistic balance, lean, and crash mechanics
[*] Online multiplayer via peer-to-peer connection — play with anyone, anywhere
[*] Solo mode for lone riders who enjoy suffering
[*] 2 courses with collectibles (presents and gems)
[*] 7 named bikes with unique colors
[*] 19 achievement badges across 7 categories
[*] 4-tab leaderboard with role tracking (Captain / Stoker / Solo)
[*] Video + voice chat between riders
[*] Save and share replay clips of your best (and worst) moments
[*] Gamepad support — ride with a controller
[*] Safety Mode for new riders learning the physics
[*] Checkpoints so crashes don't send you back to the start
[*] Whimsical music by [url=https://incompetech.com]Kevin MacLeod[/url] — licensed under [url=https://creativecommons.org/licenses/by/4.0/]CC BY 4.0[/url]
[*] Custom tandem bicycle 3D model by [url=https://skfb.ly/pqIJQ]Sameer Rayeen[/url] — licensed under [url=https://creativecommons.org/licenses/by/4.0/]CC BY 4.0[/url]
[/list]
- Physics
- Co-op
- Online Co-op
- Casual
- Indie
- Funny
- Multiplayer
- Sports
- Party Game
- Family Friendly
- Cycling
- Arcade
- lobby.png — "Choose your bike from the carousel and pick a course"
- game-start.png — "Ride toward Grandma's House — watch your speed, lean, and distance"
- grandma-finish.png — "YOU MADE IT! Stats breakdown with Perfect Ride tracking"
- achievements.png — "19 achievement badges — 8 unlocked, 11 more to chase"
- leaderboard.png — "Solo, Together, and personal leaderboards with role tracking"
- recording-finish.png — "Save and share clips of your rides"
- tandemonium-clip-finish.webm — (Use as supplemental video/trailer clip)
- OS: Windows 10 / macOS 10.15
- Processor: Dual-core 2.0 GHz
- Memory: 4 GB RAM
- Graphics: WebGL 2.0 compatible GPU
- Network: Broadband Internet connection (for multiplayer)
- Storage: 500 MB
- OS: Windows 11 / macOS 13
- Processor: Quad-core 2.5 GHz
- Memory: 8 GB RAM
- Graphics: Dedicated GPU with WebGL 2.0
- Network: Broadband Internet connection
- Storage: 500 MB
- Hero Graphic source:
images/tandemonium_three_actions.png— three illustrated panels: tandem riders dodging cones, catching air, and charging downhill. Crop/extend to 3840x1240 for Steam hero. - Logo source:
images/tandemonium_title.png— 3D "TANDEMONIUM" text with pedals, dirt, and coins. Extract/export at 940x400 with transparent background for Steam logo overlay.
| Asset | Size | Source / Approach |
|---|---|---|
| Header Capsule | 460x215 | Title logo over the center panel of three_actions.png (the crash/air moment) |
| Small Capsule | 231x87 | Title logo only — must be legible at this tiny size, drop the pedals |
| Large Capsule | 467x181 | Title logo left, cropped riders from three_actions.png right panel |
| Hero Graphic | 3840x1240 | Extend three_actions.png — widen the countryside background to fill panoramic ratio |
| Logo | 940x400 (transparent PNG) | Extract from tandemonium_title.png, remove dark background |
| Library Capsule | 600x900 | Vertical — title at top, center panel of three_actions.png (the crash) below |
| Library Hero | 3840x1240 | Same as hero graphic, or a complementary wide scene from gameplay |