How to Build a 2D Game Asset Pack with Free AI

In this video, I show you how to build a complete 2D game asset pack using FREE AI tools.
We create:
• A professional character
• A full 2D animation
• Platforms and backgrounds
• UI elements
• A complete game-ready asset set
All without drawing manually.
Tools used: – Mixboard (Character & Asset Generation) – Grok (Animation) – Blender (Green Screen & Export)
This workflow is perfect for: Game Developers Indie Developers Unity & Unreal creators AI Artists

Prompt to Grok

PROMPT — 6-Second 2D Game Animation (Strict Character Lock)

Create a 6-second animated video that simulates a 2D side-scroller video game scene.

⚠️ CRITICAL CHARACTER LOCK RULES

The main playable character must remain 100% identical to the reference design.

Do NOT change face, body proportions, hairstyle, colors, outfit, accessories, or any visual details.

The exact same character model must be used in every frame.

No redesign, no stylization changes, no random variations.

IMPORTANT — REFERENCE CHARACTERS RULE:

Any characters shown in the upper part of the image are for reference purposes only.

They must completely disappear at the very beginning of the video (frame 0) and must NOT appear in any frame of the animation.

Only the main playable character is visible during the animation.

🎮 GAME STYLE

2D side-scroller game simulation.

preserve the original character style exactly.

Smooth, game-like animation that feels like real gameplay.

Horizontal camera follow, like a playable game.

🎞️ ANIMATION ACTION (6 SECONDS)

Create a seamless looping 2D animation:

Idle → Walk → Run → Walk → Idle → perfectly back to start.

🎥 CAMERA & TECHNICAL RULES

Fixed 2D side view camera.

No rotation, no zoom, no perspective change.

Character scale and size remain identical in all frames.

Stable framing — no camera shake.

✨ QUALITY

High frame-to-frame consistency.

Sharp image, no blur, no artifacts.

Professional 2D game animation feel.

🚫 NEGATIVE RULES (STRICT)

No character redesign

No extra characters

No outfit changes

No face changes

No color changes

No distortion

No realistic 3D effects

No cinematic camera

🎯 OUTPUT GOAL

A 6-second 2D side-scroller game-style animation that looks like real gameplay, with perfect character consistency and smooth, professional motion.

📐 CHARACTER FRAMING — NO CROP (STRICT)

The main character must be fully visible at all times.

No cropping, no cut-off of the character’s head, body, arms, legs, or feet.

The character must remain entirely inside the frame in every single frame.

Maintain safe margins around the character at all times.

The camera must never push the character partially outside the frame.

Character center stays within the visible gameplay area.

HARD RULE:

If any part of the main character is cropped or cut off, the output is invalid.

🚫 ADD TO NEGATIVE RULES

No character cropping

No partial body visibility

No off-screen character movement

🚫 NO EXTRA ELEMENTS — STRICT (GROK OVERRIDE)

Do NOT add any new elements to the video.

Do NOT add objects, props, particles, effects, UI, text, icons, overlays, borders, logos, or decorations.

Do NOT add visual effects, flashes, motion lines, dust, sparks, or atmosphere.

Do NOT add background details beyond the minimal 2D level already described.

Only the main playable character and the simple predefined 2D environment are allowed.

HARD RULE:

If Grok adds any element that was not explicitly requested, the output is invalid.

➕ ADD TO NEGATIVE RULES

No extra elements

No added props

No particles or effects

No UI or HUD

No text or overlays

No logos or watermarks

Prompt to Mixboard

Create a professional character design sheet.

Image layout:

The image is visually divided into three vertical sections using composition and spacing only.

No borders, no frames, no boxes, no lines separating sections.

Top section – Reference only:

Multiple visual references of the same character:

Full-body front view,

Full-body side view,

Full-body back view,

Face close-up (front view).

This top reference section is used for visual guidance only

and must disappear immediately at the start of the video (less than one second).

Middle section:

Completely empty space.

No character, no objects, no text.

Bottom section – Final character:

The same character in one ideal full-body pose,

Natural, appealing, hero-style stance,

Centered and clearly visible.

Consistency rules:

The character must remain 100% identical across all sections.

No changes to face, body proportions, hairstyle, colors, or clothing.

Same character model in every view and pose.

Background:

Solid green background.

Restrictions:

No text, no letters, no symbols, no labels.

No borders, no frames, no dividing lines.

Technical requirements:

Vertical composition,

Aspect ratio 9:16,

High resolution.

Prompt to Mixboard

.🧠 MASTER PROMPT — FULL 2D GAME ASSET SET

Style locked to attached reference image

Prompt (English):

Create a complete and consistent 2D game asset pack in a single unified art style.

All assets must match EXACTLY the visual style of the attached reference image.

Preserve the same line quality, proportions, color palette, shading method, texture feel, and level of detail.

This is a strict style lock — no reinterpretation, no redesign, no variation.

INCLUDED ASSETS (FULL GAME SET)

1. Characters

– Original full-body 2D characters

– Clean silhouettes, animation-ready proportions

– Neutral walk-ready pose

– Fully visible, nothing cropped

2. Character Animations

– Idle

– Walk cycle

– Jump

– Clear readable poses, smooth transitions

– Consistent proportions across all frames

3. UI / HUD (Hand-Drawn)

– Life / health bar

– Points / score indicator

– Sound & music icons

– Hand-drawn, readable, game-friendly

4. Environment Props

– Trees, rocks, plants

– Houses, fences, signs

– Small decorative and interactive objects

5. Background Assets

– Foreground, midground, background elements

– Gameplay-friendly composition

– Not overly detailed or busy

6. Level Layout / Platform Assets

– Platforms, ground tiles, ledges

– Slopes, stairs, bridges

– Modular, reusable, grid-aligned

TECHNICAL & LAYOUT REQUIREMENTS

– White background only (solid white, no gradients, no textures)

– Each asset clearly separated with enough spacing for sprite slicing

– Nothing cropped or cut off

– Consistent scale across all assets

– Clean, readable shapes suitable for a 2D game engine

STYLE & QUALITY

– Exact visual match to the attached reference image

– Same artist, same world, same visual language

– Original designs only (no copyrighted characters or locations)

– Professional 2D game art quality

FINAL STYLE LOCK

Global style lock:

Match the attached reference image exactly.

No style drift, no realism increase, no simplification, no color changes.