25 AI Prompts Every Game Developer Should Know - Complete Prompt Library
These 25 prompts were published on 14 September 2025. The templates are the same. The model you should paste them into in October 2026 has a name and a price.
For writing, briefs, pitches, and docs, start on Claude Sonnet 5.5 (claude-sonnet-5-5). Anthropic’s models overview lists Sonnet 5.5 as released on 28 September 2026 at $2 per million input tokens and $10 per million output tokens, with a 1 million token context window. Opus 5.5 (claude-opus-5-5, 22 September 2026, $4 / $20) is the escalation when one script keeps failing after a single fix. The same page says that if you are unsure, start with Opus 5.5. The beginner path in How to Create a Game with Claude AI still starts on Sonnet 5.5, because Opus and Fable are expensive for a first afternoon of brackets and backstory. Confirm the id in the menu you actually have before you assume the prices above are still on the card.
These templates produce documents and scripts. They are the wrong paste if you want a game you can click in the next ten minutes. On 7 October 2026 Google opened Playground, described in the launch post as a text-to-play experiment for users in the United States aged 18 and over. Rosebud is the other browser path: a description becomes code, art, and sound in the tab. One-sentence game ideas for those tools live in 100 Game Prompt Ideas for AI Game Generators (2026). Use this page when the job is a backstory, a Unity function, a balance note, a store paragraph, or a doc.
How to use one prompt this afternoon
Budget about 45 minutes. Pick one number that matches the file you will open after the reply.
- Copy the template.
- Replace every
[bracket]with a fact from your project. If you do not know the fact, the prompt is early. - Append the stop list in the next section.
- Paste once into Sonnet 5.5 for prose, or into GitHub Copilot (or your editor’s chat) for prompts 7, 8, 9, and 21.
- Keep the paragraph, function, or table you will paste into the project today. Delete the rest of the reply.
A second prompt is a second sitting. Prompt 13 (world) then prompt 1 (character) then prompt 2 (dialogue) is a sane order across three sessions. Pasting all three in one message produces a novel the game cannot hold.
Stop list to append
Project facts I already decided: [three bullets]
Reply length: one screen, then stop.
Do not invent features, proper nouns from other games, or a second system.
If a bracket was vague, ask one question instead of guessing.Which number goes where
| Numbers | Job | Paste into |
|---|---|---|
| 1–3, 10–15 | Character, art direction, world, quest, dialogue | Claude Sonnet 5.5 or ChatGPT |
| 4–6 | Loop, level, balance as a document | Same. Playground gets a one-sentence game from the other article, after this doc exists. |
| 7, 8, 19, 20 | Scripts and technical docs | Name the engine version and the input system. Read the diff before you save. |
| 9, 21 | A bug or a profiler number you already captured | Paste the error text, the version, and the smallest function. |
| 16–18 | Pitch, store page, posts | Only features a player can see in the current build. |
| 22–24 | Community, feedback, mod docs | Strip names, emails, and payment data before prompt 23. |
| 25 | A small synthetic eval set you will label yourself | Your own examples. Private chats, paid assets, and other people’s games stay out of the paste. |
A longer tool map is in 50 Free AI Tools for Game Developers (Updated October 2026). If a generator returns an empty project, the checks in AI Game Builder Not Generating Games come before another prompt. For a course-length pass on the same skill, start at Prompt Engineering for Game Design.
Fill the brackets before you paste
The library below keeps the blanks so you can reuse them. The message you send does not.
Prompt 1, empty (weak): “Create a detailed backstory for a hero in a cool game.”
Prompt 1, filled:
Create a detailed backstory for a night-shift courier in a 2D rooftop game. Include their motivation, fears, one coworker relationship, and a defining moment. Length: 180 words. The only fact the game will show is that they are late on a 90-second route. Do not invent a war, a chosen-one prophecy, or a romance. Make them feel like a real person, not a stereotype.That reply can become a tooltip or a store “about” sentence. It cannot become a quest chain the build does not have.
Prompt 7, empty (weak): “Write a Unity C# script for movement.”
Prompt 7, filled:
Write a Unity C# script for a 2D trigger. When the player presses E inside a BoxCollider2D named InteractZone, move a Transform named Door up by 2 units over 0.4 seconds with a simple lerp. If the Door reference is null, log one error and do nothing. Assume the legacy Input class unless I say the project uses the new Input System. Name the Unity version you assumed. Do not add inventory, dialogue, or a second interaction. Include comments on the three public fields only.Open the script, check the version note, and press Play on that one door. If it fails twice on the same error, paste prompt 9 with the console line and switch that one session to Opus 5.5. Leave the rest of the project on Sonnet or on Copilot.
Prompt 17, filled enough to be safe:
Write a Steam short description under 300 characters and an About section with exactly four features for "Rooftop Late". Audience: people who like one-button score runs. Features that exist in the build today: 90-second timer, three pickup signs, a retry button, a local high score. Do not mention multiplayer, a story mode, or controller support.Steam’s own store page documentation is where you paste the result, after you have a build that matches the four features. The model does not know your depot.
Prompt 9, the smallest packet:
Debug this Unity C# method. Unity 6000.0.x, legacy Input. Error: NullReferenceException on Door.Move line 18 the first time the player presses E outside the trigger.
[paste only that method]
Explain the cause in four lines, then give the fixed method. Do not rewrite the player controller.Replace 6000.0.x with the version in Help → About. A whole-project paste hides the bug and spends the context window on files that compile.
Prompt 6 needs numbers. “The dash feels too strong” is a mood. “Dash covers 8 units, the gap is 5 units, and a second dash is allowed 0.1 seconds later, so players skip the only hazard” is a balance prompt. If you do not have the numbers, play the build once with a timer and write them down first.
Prompt 25 is an eval set, not a training run. Ask for 20 input/output pairs you will mark pass or fail by hand. Keep them in a spreadsheet. This page does not cover model training, fine-tuning, or uploading a corpus. If the task needs private player chat, stop and use prompt 23 on a redacted sample instead.
The Complete AI Prompt Library for Game Developers
Character Development Prompts
1. Character Backstory Generator
Create a detailed backstory for a [character type] in a [game genre] setting. Include their motivation, fears, relationships, and a defining moment that shaped their personality. Make them feel like a real person, not a stereotype.2. Character Dialogue Generator
Write dialogue for a [character name] who is [personality traits]. The scene: [situation]. The character should speak in a way that reveals their background and current emotional state. Keep it natural and avoid exposition dumps.3. Character Design Brief
Design a [character archetype] for a [game style] game. Include physical appearance, clothing style, weapon/equipment, and personality quirks. Focus on visual storytelling through design choices.Game Design & Mechanics
4. Core Gameplay Loop
Design a core gameplay loop for a [genre] game where players [main action]. Include progression mechanics, reward systems, and how the loop evolves over time. Make it engaging for both casual and hardcore players.5. Level Design Brief
Create a level design document for a [level type] in a [game genre]. Include layout, objectives, obstacles, secrets, and pacing. Consider difficulty curve and player skill progression.6. Game Balance Analysis
Analyze the balance of this game mechanic: [describe mechanic]. Identify potential exploits, balance issues, and suggest improvements. Consider both casual and competitive play.Code Generation Prompts
7. Unity C# Script Generator
Write a Unity C# script for [functionality]. Include proper comments, error handling, and follow Unity best practices. Make it modular and reusable.8. Game Logic Implementation
Implement [game mechanic] in [programming language] for [game engine]. Include input handling, state management, and optimization considerations.9. Bug Fixing Assistant
Debug this game development code: [paste code]. Identify the issue, explain why it's happening, and provide a fixed version with explanations.Asset Creation & Art Direction
10. Art Style Guide
Create an art style guide for a [game genre] with [mood/theme]. Include color palette, art techniques, reference materials, and guidelines for maintaining consistency across all assets.11. UI/UX Design Brief
Design a user interface for a [game type] that needs to be [requirements]. Include layout, navigation flow, accessibility considerations, and mobile responsiveness if applicable.12. Animation Description
Describe the animation for a [character/object] performing [action]. Include timing, easing, keyframes, and emotional impact. Make it feel natural and engaging.Story & Narrative
13. World Building Foundation
Create a detailed world for a [game genre] that includes geography, culture, history, technology level, and conflicts. Make it internally consistent and rich with storytelling potential.14. Quest Design Template
Design a quest for a [game type] that includes objectives, rewards, narrative context, and player choices. Make it engaging and avoid fetch quests or obvious busywork.15. Dialogue Tree Structure
Create a dialogue tree for a conversation about [topic] between [characters]. Include branching paths, player agency, and meaningful consequences for choices.Marketing & Business
16. Game Pitch Generator
Create a compelling pitch for a [game concept] targeting [audience]. Include unique selling points, market positioning, and why players should care about this game.17. Steam Store Description
Write a Steam store page description for [game title] that highlights key features, appeals to [target audience], and includes relevant tags and keywords for discoverability.18. Social Media Content
Create social media posts to promote a [game type] during [development phase]. Include behind-the-scenes content, developer insights, and community engagement strategies.Technical Documentation
19. Technical Design Document
Create a technical design document for implementing [game system]. Include architecture, data structures, performance considerations, and integration points with other systems.20. API Documentation
Write clear documentation for a game development API that handles [functionality]. Include examples, error codes, rate limits, and best practices for integration.21. Performance Optimization Guide
Analyze this game performance issue: [describe problem]. Provide specific optimization strategies, code examples, and tools for monitoring improvements.Community & Support
22. Community Management Strategy
Develop a community management strategy for a [game type] with [player base size]. Include engagement tactics, content calendar, and crisis management protocols.23. Player Feedback Analysis
Analyze this player feedback: [paste feedback]. Identify key themes, prioritize issues, and suggest actionable improvements for the development team.24. Modding Support Documentation
Create documentation for modders who want to extend [game name]. Include tools, file formats, best practices, and examples of successful mods.Advanced AI Techniques
25. Custom AI Training Data
Generate training data for an AI model that needs to [specific task] in game development. Include input/output examples, edge cases, and quality metrics for evaluation.Check the reply before you keep it
A finished paste is a file in the project, not a longer chat.
| You used | Keep the reply only if |
|---|---|
| 1, 2, 13, 15 | Every proper noun either came from your brackets or is generic enough to rename in one pass. |
| 4, 5, 14 | You can point at one room, one verb, and one reward that already exist or that you will build this week. |
| 6, 21 | The reply cites the numbers you supplied. A new number with no playtest behind it is a guess. |
| 7, 8, 9 | The script compiles, the console line you pasted is gone, and you did not accept a rewrite of unrelated classes. |
| 10, 11, 12 | A teammate can match a color, a screen, or a timing in seconds without asking you what the model “meant.” |
| 16, 17, 18 | A player can find each advertised feature in the current build. |
| 19, 20 | The doc names real types and real error paths from your code, or it is clearly marked as a proposal. |
| 22, 24 | The calendar and the file formats match tools you already ship. |
| 23 | The sample you pasted had no emails, receipts, or account ids. |
| 25 | You can mark each row pass or fail without calling the model again. |
If the reply fails that row, send one correction that quotes the bad sentence. Asking for “more detail” makes the same invention longer.
When the reply is a picture or a playable build
Prompts 10 and 12 describe art and motion. They do not generate the PNG or the clip. Hand the color list and the timing to the art tool you already use, and compare the result to the guide. A separate walkthrough for asset tools is How to Generate Game Assets with AI (2026).
Prompts 4 and 5 are paper. When the paper names one verb, copy that verb into a single sentence and use the Playground or Rosebud path from the 100-prompt article. The first-session checklist for Playground is Google Playground First Indie Prompt-to-Play Lab Worksheet 2026. If the generator returns nothing, fix the builder setup before you rewrite the design doc.
Which prompt matches Monday
Open the project and pick the row that matches the file you will touch. One row is the whole session.
| If today’s file is… | Use | Done when |
|---|---|---|
| A character who still has no reason to be in the level | 1, then stop | You can say the motivation in one sentence a player could notice. |
| Lines that explain the plot out loud | 2 or 15 | You can delete the line and the scene still communicates the fact. |
| A loop you have not timed | 4, after you play one round with a stopwatch | The reply uses your measured seconds. |
| A door, trigger, or score function | 7 or 8 | Play Mode shows that one behavior and the console stays quiet. |
| A red error you can reproduce | 9 | The same steps no longer throw. |
| A store paragraph that mentions a mode you have not built | 17 | Every feature in the text is in the build you will upload. |
| A pile of comments from players | 23, after you delete emails and account ids | You have a ranked list of three fixes, not a rewritten game. |
If none of those files are open, you do not need a prompt yet. Play the build and write down the number the table is missing.
Key takeaways
- The 25 templates are from 14 September 2025. In October 2026, prose prompts go to Claude Sonnet 5.5; one stuck script can move to Opus 5.5.
- Fill every bracket with a project fact. Append the stop list so the reply stays one screen.
- Prompts 7, 8, 9, and 21 need an engine version, an input system, and the smallest function that fails.
- Prompts 16, 17, and 18 may only advertise features the current build already shows.
- Prompt 23 gets redacted feedback. Prompt 25 gets synthetic rows you will grade yourself.
- Playground (7 October 2026) and Rosebud take a one-sentence game. That list is the other article. This list is the brief, the script, and the store paragraph.
- Keep the reply only when you can paste it into a file today. A second prompt is a second sitting.
- Stack 13, then 1, then 2 across separate sessions when you need world, character, and lines in that order.
FAQ
Which Claude model should I use for these prompts in October 2026
Sonnet 5.5 (claude-sonnet-5-5) for every writing prompt and for the first pass on a small script. Move one failing script to Opus 5.5 after the same error survives a single fix. Check the id and the price on Anthropic’s models overview before a long session. ChatGPT is fine for the same prose prompts when that is the subscription you already pay for.
Can I paste these into Google Playground
Playground wants a game you can play. Prompts 1 through 25 are briefs, code, and docs. Write the brief here, then take one verb to the 100-prompt list if you want a browser build. Playground’s October 2026 launch is for the United States, ages 18 and over.
What do I put in the brackets
A fact you can point at: the genre, the engine version, the key name, the timer, the four features that are already in the build. If the bracket says [paste code] or [paste feedback], paste the smallest sample that still shows the problem, with personal data removed.
Is prompt 25 a model-training tutorial
No. It asks for a labeled example set you can score by hand. It is not a recipe for training, fine-tuning, or collecting someone else’s content.
How many prompts should I send at once
One. World, character, and dialogue are three sittings (13, then 1, then 2). One sitting that pastes the whole library produces a document you will not finish.
What if the script looks plausible and still will not compile
Paste prompt 9 with the console text, the editor version, and that one method. If the second reply repeats the same mistake, switch that chat to Opus 5.5 or to Copilot in the editor, where the file and the error are both visible. Do not accept a rewrite of classes you did not paste.