🟢 Xbox2012Playground GamesVERY HARDForza Horizon rebuild deck
VERY HARD
The handling model will feel good by Sunday, which leaves you holding a hundred square kilometres that somebody has to make worth driving across.
You will get a good prototype. The product is what comes after.
The driving model is a weekend and it will feel good — arcade physics is far more promptable than simulation. It is a NOT REALLY because Forza Horizon is a world-building product: the achievement is 100 square kilometres that are worth driving across, and that is an art department, not a prompt. Build the terrain streaming and rewind buffer; those are the genuinely fun engineering bits.
- Difficulty
- VERY HARD · 4 of 5
- First playable
- A project
- The original
- 150 team-years
- Released
- 2012 · Xbox
- Genre
- Racing
Build an open-world arcade racer prototype. three.js, procedural terrain, one car class, drivable in a browser. Requirements: - Procedural open world: heightmap from layered noise, a road network generated as splines snapped to the terrain with cut-and-fill, and biome-based scatter for trees and props. Chunked terrain with LOD, streamed in and out around the camera — you cannot hold an open world in memory. - Arcade vehicle physics: raycast suspension at four wheels, a simplified slip curve with a generous grip plateau, assisted counter-steer, and a drift mode that triggers on handbrake and rewards angle. Forgiving, not simulation — the fantasy is competence. - Off-road matters: surface types (tarmac, gravel, grass, sand) with different grip and particle effects, so cutting a corner across grass costs you time but is always allowed. Never put an invisible wall anywhere. - Anywhere-races: the player can start an event from any point on the map, and the route is generated along the road spline network with checkpoints. - Rewind: store a ring buffer of vehicle state at 60Hz and let the player scrub back three seconds. Simple, and it changes the entire feel of failure. - Rendering: cascaded shadow maps, screen-space reflections on the car body, a day/night cycle with headlights, and speed-scaled FOV plus a light motion blur. - A drone/photo camera mode, because half of what people do in these games is take pictures. Definition of done: I drive off the road, through a field, rewind my crash, and never once hit an invisible wall.
- An open world at real-world scale, built by a large art team
- Hundreds of licensed cars, each individually modelled and tuned
- A shared-world multiplayer layer running constantly in the background
- The event and progression design that makes an open world feel full
Assists priced as a reward multiplier
Difficulty as a menu setting splits the playerbase and quietly shames whoever picks easy. Assists with a published multiplier keep everyone in the same game on the same leaderboard, each player negotiating their own trade between competence and credit, and you get an honest skill ladder without a single balance meeting.
ScopeA weekend— build just this, not the game
Build a driving toy where assists carry a published price. Single self-contained HTML file, Canvas 2D, top-down, no dependencies, no build step. - A vehicle with acceleration, steering, lateral grip and a handbrake, on a short walled circuit with a lap timer. - Five independent assists, each its own toggle with its own multiplier: a racing line overlay, stability control clamping counter-steer, traction control limiting wheelspin, automatic braking into corners, and forgiving walls that scrub speed instead of stopping you. - A lap pays a base figure times the product of every active assist's multiplier. Show the live multiplier and projected payout permanently on screen, next to what this same lap would pay with everything off. - No difficulty presets anywhere. Assists are chosen individually, always available, never bundled, never buried in a menu the player visits once. - A leaderboard holding raw lap time and payout, sortable by either. Definition of done: my fastest lap, fully assisted, pays less than my slowest clean lap with everything off, and both sit on the same board.
Not a clone — Forza Horizon re-themed and cut down to something you can finish. The angle is the important reel: it is what turns a project into a weekend. 24,360 ways to land.
Orbital Teletype
Forza Horizon, but text-only, in a terminal, set in deep space. Rendered in VHS camcorder night.
Build a browser game called "Orbital Teletype". The pitch in one line: a racing in the spirit of Forza Horizon, but text-only, in a terminal, set in deep space. WHAT THIS IS Take the SHAPE of Forza Horizon — its core loop, and whatever makes that loop good — and rebuild it as your own game in a different world at a smaller scope. Use your own names, art and audio, which you want anyway: a reskin of somebody else's game is less interesting than a new one that works the same way. THE ANGLE — this is the important constraint, honour it above everything else Text-only, in a terminal. A monospace grid and nothing else. Forces the writing and the systems to carry everything, and the entire art budget goes to zero. This is what makes the project finishable. If a decision would push the scope back towards the original's, take the smaller option every time. THE THEME Deep space. Vacuum, delay and no help coming. Sound only travels through the hull. The theme is not a coat of paint. Let it change what the mechanics mean — a reload, a health pack and a locked door should all be things that make sense in this world and nowhere else. LOOK VHS camcorder night. Tracking lines, timestamp burn-in, autofocus hunt, and crushed blacks with over-bright headlights. REQUIREMENTS - Runs in a browser with no build step. Canvas 2D unless the angle genuinely requires 3D, in which case three.js. - Fixed-timestep update loop with interpolated rendering, so it behaves the same at 60Hz and 144Hz. - Every tuning constant in one CONFIG object at the top, exposed as live sliders in a debug panel. You will find the feel by dragging those, not by prompting. - All content — levels, entities, balance numbers — in JSON or plain data files, never inline in the logic. - Audio generated with the Web Audio API rather than asset files. - Respect prefers-reduced-motion: keep the fades, drop the shake and the parallax. BUILD ORDER 1. The core loop with placeholder rectangles, at the reduced scope the angle demands. No theme, no art, no audio. Make it fun as rectangles first. 2. The angle's consequences. Cutting to bots, or to turn-based, or to one level changes the design rather than just shrinking it — find out how and rewrite step 1. 3. The theme, as content and data. 4. The look, applied last as a rendering layer over a game that already works. Start by writing a one-page plan: the core loop, what the angle removes and what that frees you to do properly, and what you are deliberately leaving out. Wait for me to approve it before writing code.
Half the time one of these already does what you wanted, and the other half it saves you a week of solving a problem someone documented in 1997.
One count per game. No account — it is tied to a salted hash of your IP, which is not stored in a form anyone can reverse. Every build adds 150 team-years to the counter on the homepage.
Then try these
Questions
How hard is Forza Horizon to rebuild with an AI agent?
Yes — every game is buildable at some scope. The question is how hard, and Forza Horizon is VERY HARD (4 of 5). You will get a good prototype. The product is what comes after. The handling model will feel good by Sunday, which leaves you holding a hundred square kilometres that somebody has to make worth driving across. Reckon on a project to something you can actually play — not to something that matches the 150 team-years Playground Games spent.
What makes Forza Horizon hard to rebuild?
The handling model will feel good by Sunday, which leaves you holding a hundred square kilometres that somebody has to make worth driving across. That is why it sits at VERY HARD rather than a tier either side of it. If you want the idea without the project, the transferable part is assists priced as a reward multiplier — a weekend of work.
How long does it take to build a Forza Horizon clone?
Wrong question, and it is worth saying why. Nobody rebuilds Forza Horizon — the original took Playground Games on the order of 150 team-years, released in 2012 on Xbox. What you can do is reach something playable and genuinely yours in about a project, and then keep going for as long as it stays interesting. Any figure that claims otherwise is measuring a prototype and calling it a game.
What do I lose by building my own Forza Horizon?
An open world at real-world scale, built by a large art team. Hundreds of licensed cars, each individually modelled and tuned. A shared-world multiplayer layer running constantly in the background. Those are the parts a prompt will not hand you.
Which AI coding agent should I use to build it?
Any of Claude Code, Codex or Cursor will handle this prompt. Paste it as your first message, let the agent scaffold the project, then iterate on feel — the second, third and tenth prompts are where a game actually gets good. Work in an empty folder or a fresh git branch so you can throw it away cheaply.
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