[petegordon]

Part of #611. What's left (time warp mode, the Solo Flight bots, splashes) is in #644. Pete, 2026-11-07: "This is good let's get it into Tandemonium."

What the player sees

• Time Warp is the last entry in the bike chooser. It's Pete's steampunk time-travel tandem: a maroon and brass frame, the clock between two glowing blue tubes, sprung saddles, a brass headlamp, the goose fin, and four rockets, a stacked pair on each side of the rear wheel.
• Locked: a dark silhouette of the bike with "n of N achievements" over it. N is any 90 of the 95 non-calendar achievements, as decided on Time Warp bike (95/100) + time warp mode + All 100 bike #611. Today's list gives 88 of 93; once the Achievements: swap out the 30-day, 4-week, photo-finish and Century badges; add Underdog, Clean Sweep, Full House, Rainbow Gold; Lifer = 100 rides; 5K Together #608 swap lands it becomes 90 of 95 with no code change. A tooltip spells out the rule. Picking it while locked leaves the ride on the default bike.
• Unlocked: the bike shows in colour with its clock and flames running in the preview, and picking it makes it the ride's bike.
• In the ride:
  • the minute hand spins two turns a second;
  • the blue flames always burn and flicker, and each engine pops a big orange/red flame now and then;
  • both geese ride it in any outfit, the robots included, exactly as on the tandem, at the same size.
• Crashes: the wheels, front bars, saddles and stoker bars fly off, as on the tandem.

How

• js/special-bikes.js (new): the special-bike keys, plus bikeModelPathFor(showRiders, key), which picks the GLB a chooser pick rides.
  • Show Riders off rides the plain frame, because it has no rig to swap onto.
  • ?riders=fused is left alone.
• js/rewards.js: timeWarpProgress() counts the non-calendar achievements, less 5 (TIME_WARP_SLACK).
• js/lobby.js, the chooser:
  • the Time Warp's own model loads the first time it's shown;
  • the dark silhouette is a material swap, with the count in the existing #bike-hint overlay;
  • the TimeWarpFX loop runs in the preview loop.
• js/game.js:
  • _applyBikeChoice() replaces the three ride-start applyPreset calls. It swaps the model through the existing BikeModel.swapModel; the swap does nothing when that bike is already loaded.
  • The Show Riders toggle keeps the pick.
  • Versus loads the goose tandem fresh instead of cloning a Time Warp, because the team colours are paint presets.
• js/bike-model.js:
  • A bike on the tandem's rig is scaled by the tandem's length (2.466 m) instead of its own. Its rockets and flames make it longer, which would shrink the geese.
  • The flames don't count toward its centring bounds.
• js/goose-riders.js / goose-rider-clips.js:
  • TimeWarpFX is cut to the Clock* / Flame* bones and plays on the wall clock.
  • The wheel is measured from TW_Wheel_R.
• Asset: tandem-3d/goose/time_warp_tandem.glb
  • from petegordon/tandemonium-claude-3d feat/time-warp-tandem, scripts/make_time_warp.py, docs/time-warp-tandem.md;
  • built on bike_rigged_goosefit26, the game tandem's own rig, so every socket, Pedal and WheelSpin is unchanged;
  • about 42k triangles, 0.93 MB, glTF validator 0 errors / 0 warnings.

Tests

• npm test: 829/829. New special-bikes.test.mjs covers:

  • the 90-of-95 rule (whichever five are skipped; calendar achievements never count);
  • the model choice;
  • the effect clip's bones;
  • the GLB keeping the rig.

• npm run smoke:time-warp (new, SR-30): 15/15. It checks:

  • the locked silhouette and its count;
  • the unlock;
  • the preview animating;
  • a solo ride with both geese seated, the effect loop on its bones, the wheel measured and the tandem's scale;
  • Show Riders off and back on;
  • a return to a paint preset.

  It's in the runner and in CI's modes group.

• Fit check with the Time Warp swapped in for the tandem (local only): 45/45 for victorian, georgian and robot.

• smoke:geese locally ran its first steps, then hit Chrome's 15-minute limit on its long colour-sampling step under software rendering. The new code only acts when a bike has a TimeWarpFX clip, and the tandem has none. The full smoke suite is running on this branch in CI.

Not in this PR (#644)

• Time warp mode itself: the Time Warp unlocks the bike only.
• Solo Flight in the chooser, and the bots.
• The reward splashes.

🤖 Generated with Claude Code

https://claude.ai/code/session_01VDbZGqC4HxZpHsv78dTqjQ

[github-actions]

PR Preview Action v1.8.2
🚀 View preview at https://petegordon.github.io/Tandemonium/pr-preview/pr-647/
Built to branch gh-pages at 2026-11-07 19:43 UTC. Preview will be ready when the GitHub Pages deployment is complete.