Making a Sonic Fan Game in Clickteam Fusion 2.5: Complete Roadmap & Sonic Worlds Delta

Creating a Sonic fan game in Clickteam Fusion 2.5 (successor to MMF2) is ambitious but doable. Here's a structured roadmap.

1. Plan & Scope

• Core Loop: Platformer? Runner? Metroidvania? Define 1–3 acts.
• Assets: Sprites (Sonic: idle, run, jump, roll, spindash, hurt), enemies, tilesets, UI. Use Spriters Resource (credit) or draw own.
• Engine Choice: Fusion's built-in platform movement is not Sonic-like. You'll need a custom physics engine (events-based).

2. Custom Sonic Physics (Events)

• Variables: X/Y Velocity, Ground Speed, Air Speed, Acceleration, Deceleration, Top Speed, Gravity, Jump Force, Slope Factor.
• Key Behaviors:
  • Acceleration curves (not instant max speed).
  • Slope physics (speed up downhill, slow uphill, stick to curves).
  • Roll/Spindash: charge → release → burst speed + invincibility + hitbox change.
  • Collision: Floor/Wall/Ceiling sensors (fast loops need multiple detectors).
• Reference: Sonic Physics Guide (Mercury, Sonic Retro) for exact values.

3. Fusion Implementation

• Objects: Player (Active), Collision Mask (separate, invisible), Camera, Enemies, Rings, Springs, Level Geometry (Backdrops / Quick Backdrops).
• Fastloops: For per-pixel collision, slope detection, spindash charge.
• Qualifiers: Group enemies, solids, hazards for event efficiency.
• Shaders: For water, blur, CRT look (Fusion 2.5+).

4. Level Design

• Frame = Zone/Act. Use Frame Editor for layout.
• Modular chunks (start, loops, slopes, platforms) → copy/paste.
• Path nodes for camera bounds.

5. Polish & Systems

• HUD (Rings, Lives, Time, Score).
• Pause / Game Over / Continue.
• Save/Load (INI object).
• Music (OGG) + SFX.

6. Legal & Community

• Non-commercial only. Sega tolerates fan games if free, no assets ripped from modern games.
• Join Sonic Fangaming HQ (Discord/Forum), MFGG, Sonic Retro for feedback, engines (e.g., Sonic Worlds Delta – pre-made Fusion engine).

Better Starting Point: Sonic Worlds Delta

A feature-complete Fusion 2.5 engine with Sonic physics, enemies, objects, level format. Build levels, not engine. Highly recommended.

Start small. One act. One mechanic. Iterate. Have fun.