Save any race.
Pause, hit “Save this race”: a small local file that replays the whole race exactly, ending on the moment you wanted to talk about. Feedback points to a tick, not a memory.
- AccoBolide
- A VECTVR game
- In development
AccoBolide
Road crews take over the grid.
Eight maintenance tractors, French country roads, and a choice on every corner: hold the racing line, or work the roadside and cash it in for a boost, or something to throw. It is also the game where ReplayLab is born.
Watch the film- Genre
- Arcade kart racing
- Platform
- Web browser
- Grid
- 8 tractors
- Stage
- Playable prototype
THE ROAD IS THE RACE.THE VERGE IS THE GAME.
ReplayLab × AccoBolide
BORN ONTHE D17.
Every tool we will sell is first a problem we had. A kart racer with eight AI rivals, items, contacts and roadside work is a machine for producing “that felt wrong” moments. Here is what already runs inside the game, and what comes next.
Works today Already running in AccoBolide
Same race, every browser.
The same race produces identical state hashes in Node, Chromium, Firefox and WebKit. Determinism is tested, not assumed.
Golden replays guard every change.
A refactor must leave reference replays identical to the bit. A rule change re-derives them on purpose, and says so.
Decisions written before the numbers.
Eleven balance decisions pre-registered so far: the rule is written first, then measured on 200 seeds minimum, with a control re-run the same night.
Races that explain themselves.
Contact episodes, lead changes, work yield and item usage, exported with a list of what the counters cannot prove.
Next, on AccoBolide first
- Building nextExternal playtests, with each player’s comments pinned to the exact tick.
- Building nextBuild-to-build comparison of the same sessions.
- Design contracts checked on every build and every human session.
- What-if branches: fork a human race and let bots finish it 200 times.
ReplayLab × AccoBolide
CASE FILE 001:DOES THE VERGE PAY?
The whole design rests on one promise: working the roadside should be worth leaving the racing line. Here is how we interrogate that promise with ReplayLab, on a real race.
Verge worked (m) · finishing place
- 01
Open the session.
One archived race on the D17: eight tractors, 70 seconds, 261 events. The viewer puts every boost, hit, throw and finished patch of verge on one timeline.
Works today - 02
Follow the workers.
Gégé Gravillon worked 85 m of verge and finished fifth. Le Cantonnier worked 75 m and finished fourth. The winner, Momo Bitume, worked just 20 m.
Works today - 03
Know what one race can’t say.
The report says it itself: one race describes a situation, not a frequency. A hunch is not a conclusion.
Works today - 04
Re-run it 200 times.
Same build, seeds 1 to 200, AI drivers only: the hardest worker finishes in the top three in 177 of 200 races (88.5 %). The archived race was the exception, which is exactly why one replay is never enough.
Works today - 05
Make it a contract.
“The hardest worker reaches the podium in at least 80 % of races.” ReplayLab checks it on every build and every human session, and lets you fork any moment to ask what if.
DNF: the race stops when the tracked seat crosses the line; two tractors had not finished yet.
Five trades
EVERY TOOLHAS A SOUL.
Each tractor carries the tool of a real road-crew trade. Working the verge costs you the racing line, and pays you back.
The flail mower
Cut the long grass along the verge. Clean work, steady rewards.
The road sweeper
Clear the gravel off the bends before it sends someone into the hedge.
The hedge cutter
Trim overhanging branches. Leaves fly, rivals duck.
The ditch digger
Clear the ditches. Messy, risky, worth it.
The patching rig
Fill the holes in the road at full speed. Precision pays.
All five tools already drive in the prototype. Their rewards are still being tuned: that is exactly what ReplayLab is for.
Risk & reward
Easy to pick up.
Accelerate, steer, drift. Anyone can finish a race on their first try.
Hard to master.
When to leave the line, how long to work, when to throw: every lap is a string of small bets.
Anyone can win.
Comebacks are real, without punishing the driver who drives well.
Road atlas
SIXTEEN ROADS.ONE COUNTRYSIDE.
Every circuit gets its own character, from a poppy-lined départementale to a Christmas retail park. Three already drive in the prototype; the rest are on the drawing board.
- 01D17 des CoquelicotsDépartementaleWorks today
- 02Bocage de la FauchetteBocageWorks today
- 03Col du Cantonnier, versant sudMontagneWorks today
- 04Col du Cantonnier, versant nord de nuitMontagne · nuit
- 05Allée des PlatanesRoute nationale
- 06Nationale des MoissonsPlaine céréalière
- 07Forêt de FauchecourtForêt
- 08Marais de la RagondineMarais
- 09Vallée des CruesVallée inondable
- 10Traverse de Saint-Fauchant-en-FêteVillage en fête
- 11Aire de la TruffièreAire de repos
- 12Rocade de BordevoieRocade
- 13Zone industrielle NordZone industrielle
- 14Zone commerciale de NoëlZone commerciale
- 15Grand Tour du CEICentre d’entretien
- 16Piste d’essaiCircuit d’essai
The world
Next on the road
In development
WANT TOPLAYTEST?
hello@vectvr.comAccoBolide will open to external playtesters soon. Tell us you’re in.
VECTVR · France · est. 2026