Unity (C#) / WebGL2D Puzzle PlatformerIndependent Commercial Prototype — 16 Handcrafted Levels

Split You

One move. Two consequences.

A dual-character puzzle platformer where movement inputs are shared between a green ninja and a pink ninja clone across 16 handcrafted levels, requiring simultaneous arrival at dual exit doors.

Architecture Spec · Split YouWebGL Certified Build

01 · Design Challenge

The Problem & Design Challenge

When a single player input command broadcasts simultaneously to multiple physics-driven bodies, level geometry complexity multiplies exponentially. A jump that clears a spike pit for Character A can catapult Character B directly into a crushing hazard. The core challenge was making this dual-character relationship understandable, perfectly deterministic, and satisfying rather than arbitrary or punitive.

Key Technical & Mechanical Roadblocks:

Input Determinism: Both characters must interpret identical input vectors synchronously without jitter, desynchronization, or frame latency.
Clone Spawning Validation: Dynamically spawning the ninja clone must account for nearby colliders, ensuring it never embeds in terrain or clips through geometry.
Dual-Door Victory Protocol: Completing a level requires both entities to independently satisfy entrance thresholds and trigger activation in the exact same timeframe.

02 · Systems Architecture

Implementation & Architectural Decisions

Engineered an Observer-driven input broadcaster and dual-entity state coordination engine in Unity C# with Raycast-based ground detection.

DECISION 01

Broadcast Input Routing Architecture

Created an InputBroadcastHub that decouples raw keyboard/touch reads from entity logic. Both primary player and clone subscribe to identical event channels, applying directional velocity and jump impulses in LateUpdate/FixedUpdate.

DECISION 02

Symmetric / Asymmetric Movement Controllers

Implemented modular CharacterController2D scripts with box raycasting for precise ground detection, coyote time, and jump buffering to ensure responsive platforming feel regardless of entity spacing.

DECISION 03

Coordinated Dual-Door Validation

Door sensors operate as state observers. A centralized LevelCompletionValidator monitors both door trigger volumes; only when both Character A and Character B are within their respective matched doors does the level unlock.

Source Implementation: DualCharacterCoordinator.cscsharp · Unity Engine

using System;
using UnityEngine;

public class DualCharacterCoordinator : MonoBehaviour
{
    [SerializeField] private CharacterMovement primaryNinja;
    [SerializeField] private CharacterMovement cloneNinja;
    [SerializeField] private DoorSensor greenDoor;
    [SerializeField] private DoorSensor pinkDoor;

    public event Action OnLevelCompleted;

    private void Update()
    {
        // Sample inputs once per frame
        float horizontal = Input.GetAxisRaw("Horizontal");
        bool jump = Input.GetButtonDown("Jump");
        bool interact = Input.GetKeyDown(KeyCode.W) || Input.GetKeyDown(KeyCode.UpArrow);

        // Broadcast identical inputs to both active entities
        primaryNinja.ProcessMovement(horizontal, jump);
        if (cloneNinja != null && cloneNinja.gameObject.activeInHierarchy)
        {
            cloneNinja.ProcessMovement(horizontal, jump);
        }

        // Validate simultaneous completion trigger
        if (interact && CanCompleteLevel())
        {
            ExecuteLevelCompletion();
        }
    }

    public bool CanCompleteLevel()
    {
        bool primaryReady = greenDoor.IsOccupiedBy(primaryNinja);
        bool cloneReady = (cloneNinja != null) && pinkDoor.IsOccupiedBy(cloneNinja);
        return primaryReady && cloneReady;
    }

    private void ExecuteLevelCompletion()
    {
        greenDoor.LockDoor();
        pinkDoor.LockDoor();
        OnLevelCompleted?.Invoke();
    }
}

ℹ This centralized coordinator ensures single-frame input parity and strictly enforces that both doors must be occupied before victory state triggers.

03 · Outcomes & Proof

Results & Measurable Impact

Shipped 16 full handcrafted puzzle levels in browser WebGL, receiving enthusiastic community feedback for tight controls and creative level progression.

16 Levels

Levels Shipped

Handcrafted puzzles with smooth difficulty curve from tutorial to master.

Sub-frame

Input Parity

Zero movement deviation between linked entities on identical terrain.

~20 MB

WebGL Size

Brotli-compressed build loads in under 4 seconds on desktop and mobile.

Architectural Takeaways:

In puzzle platformers, predictability is the foundation of player enjoyment — arbitrary physics destroy puzzle logic.
Separating input reading from movement execution makes multi-character coordination clean, testable, and maintainable.

Experience Split You In Action

Playable right now in your browser with full WebGL performance.

Launch Browser Game →Next: Tiny Together →

divyanshu.

using System; using UnityEngine; public class DualCharacterCoordinator : MonoBehaviour { [SerializeField] private CharacterMovement primaryNinja; [SerializeField] private CharacterMovement cloneNinja; [SerializeField] private DoorSensor greenDoor; [SerializeField] private DoorSensor pinkDoor; public event Action OnLevelCompleted; private void Update() { // Sample inputs once per frame float horizontal = Input.GetAxisRaw("Horizontal"); bool jump = Input.GetButtonDown("Jump"); bool interact = Input.GetKeyDown(KeyCode.W) || Input.GetKeyDown(KeyCode.UpArrow); // Broadcast identical inputs to both active entities primaryNinja.ProcessMovement(horizontal, jump); if (cloneNinja != null && cloneNinja.gameObject.activeInHierarchy) { cloneNinja.ProcessMovement(horizontal, jump); } // Validate simultaneous completion trigger if (interact && CanCompleteLevel()) { ExecuteLevelCompletion(); } } public bool CanCompleteLevel() { bool primaryReady = greenDoor.IsOccupiedBy(primaryNinja); bool cloneReady = (cloneNinja != null) && pinkDoor.IsOccupiedBy(cloneNinja); return primaryReady && cloneReady; } private void ExecuteLevelCompletion() { greenDoor.LockDoor(); pinkDoor.LockDoor(); OnLevelCompleted?.Invoke(); } }