Make a Racing Game With AI: Handling Before Opponents
To make a racing game with AI, start with one vehicle on one looped track and no opponents, and tune it until driving alone is fun. Count laps with checkpoints, then race a ghost of your own best lap before you add any rivals.
What is really hard about driving?
A handful of numbers that fight each other. Speed, turning and grip all pull against one another, and the camera does half the work of making any of it feel right.
Picture wooden soapbox carts rattling down through a mountain village. No engines, only the slope, the brakes and how bravely you take the bend. Turn too sharply on wet cobbles and the cart should slide, not stop dead. Too much grip feels like driving on rails. Too little feels like soap.
Your AI cannot tell which is which, because the difference lives in your hands. So ask it to put those numbers in one place with plain names, and spend an evening changing them yourself. One more tip: ask for simple, pretend physics. A faithful simulation of tyres is a huge job and often less fun than a cheerful fake.
What should you build first?
A short loop with one hairpin bend and a timer. No menus, and no other carts. If beating your own time on that one bend makes you say "one more go", you have a racing game.
Then grow it in this order:
- Driving on flat, empty ground.
- A camera that follows and looks ahead into the corner.
- The track, with something that slows you when you leave it.
- Checkpoints and a lap counter.
- A ghost, which is a see-through replay of your best lap.
- One rival.
- A second track.
Step 4 has a trap. If a lap counts whenever you cross the line, players can reverse over it again and again. Hide several checkpoints around the track, and only count the lap if all of them were passed in order.
Why are ghosts such a good idea?
Because a ghost is a race with no rival code at all. The game records where you were, and plays that back next time. You get something to chase, it drives exactly as well as you do, and it can never get stuck on a wall.
What sinks these projects?
Rival cars, too early. They look like a small task and turn out to be the biggest one. A rival has to find the racing line, slow for bends, recover from crashes and avoid looking stupid or unbeatable. People pour weeks into opponents that bounce along the walls, while the driving itself never gets better.
The same goes for keeping the race close. Secretly slowing the leader and speeding up the last cart can work, but players notice when it is obvious. Save that for last, and keep it gentle.
Paste this to your AI
Build a small top-down racing game: one vehicle, one looped track with one hairpin bend, no opponents. Keyboard controls and a lap timer.
Start with a state machine in a Mermaid diagram of the race: countdown, racing, off the track, checkpoint passed, lap done, finished, restart. Work out from it what happens if I turn round and cross the finish line backwards. Then build from the diagram.
Count a lap only if every checkpoint was passed in order. Put speed, turning and grip in one place with plain names so I can change them.
When you say lap counting works, tell me the exact routes you tried, including the sneaky ones: reversing over the line and cutting across the grass. If you did not try a route, say you do not know what it does. Never tell me the driving feels good. That one is mine to judge.
Or skip this and connect the MCP: your AI then finds all of this by itself.Connect the MCP
How to check it worked
- Reverse over the line. The lap counter should not move.
- Cut the corner. Drive straight across the inside of the track. The lap should not count.
- Hit a wall flat out. You should bounce or slow down, and never stick or fly off.
- Change grip by a lot. Try double, then half. You should feel it at once.
- Race your ghost. It should follow your last best lap exactly.
- Watch someone take the hairpin. If they crash every time, the bend or the turning needs work.