Make The Sum 21

Make the Sum21 // Cyberpunk Matrix Puzzle

Hack the grid. Master the math. Clear the stack before system timeout.

Sum21 is a fast-paced, synthwave-infused arcade puzzle game that tests your mental math, speed, and spatial strategy under pressure. Set against a high-octane cyberpunk aesthetic, your task is simple: connect numeric node cards across the grid to equal a target sum of 21 before the lock-out timer expires.

Think fast, execute precisely, and prevent system overflow.

⚡ Key Features

• High-Stakes Mental Math: Combine cards on a 3x3 matrix to hit exactly 21. One over-calculation triggers an immediate system bust!
• Dynamic Laser Mesh UI: Drag and connect node paths on the fly, triggering responsive visual lasers and synthwave particle explosions.
• Escalating Time Pressure: Advance through 6 increasingly intense security levels with tighter deadlines and complex card combinations.
• Smart Solution Assist: Got locked out? The built-in solver automatically highlights valid card combinations on failure to sharpen your tactical instincts for the next run.
• Retro Synthwave Aesthetic: Immerse yourself in glowing neon vector grids, high-contrast dark mode interfaces, and crisp arcade feedback.
• Instant HTML5 Playability: Zero downloads required—fully optimized for smooth, lightweight browser performance on both desktop and mobile touchscreens.

🕹️ How to Play

1. Select Cards: Click or tap adjacent numerical card nodes on the grid to accumulate your total.
2. Hit 21: Reach a sum of 21 exactly to clear the target, grant clearance, and unlock the next security tier.
3. Avoid the Bust: Going over 21 instantly locks the terminal!
4. Beat the Clock: Complete each puzzle stage before the countdown runs out.

📋 Game Details

• Genre: Arcade / Puzzle / Strategy
• Platform: Web Browser (HTML5)
• Controls: Mouse or Touchscreen
• Engine: Phaser 3