Equinox Exchange

Equinox Exchange

A single-player puzzle-platformer for Reddit. You steer two linked blobs that share one pool of size: make one big and heavy and the other becomes small and light. Master that Equivalent Exchange — a big blob presses heavy plates and tips seesaws; a small blob jumps high, floats on bubbles, and squeezes through gaps — to guide both blobs to their matching exits.

Two blobs. One shared size. Trade it wisely.

How to play

• Tap / click a blob to take control of it (a gold ring shows who you're driving).
• Move: A D or ← → (or the on-screen ◀ ▶ on mobile).
• Jump: Space / W / ↑ (or the JUMP button).
• SWAP: E (or the SWAP button) — flips which blob is big. Size is shared, so one always grows as the other shrinks.
• Goal: get both blobs onto their colour-matched exits at the same time.

The toolbox

Game modes

Campaign (PLAY)

A fixed sequence of 15 levels (3 tutorial/practice + 12 main), each a unique mechanic or combination, ordered easy → hard. Progress is saved per-player and unlocked sequentially — you must clear a level to unlock the next.

• Level Select (LEVELS on the main menu) shows every campaign room with clear visual states:
  • ★ Completed levels — gold-accented card with a gold star
  • ✦ Current level — gold glowing border with a gentle pulse animation to draw your eye
  • ◻ Unlocked levels — neutral elevated cards, ready to play
  • 🔒 Locked levels — dimmed cards with a lock icon, unreachable until you clear the one before them
• Practice rooms are marked with a "P" prefix (P1, P2, P3) and teach the core mechanics before the main campaign begins.
• Every room awards 1–3 stars based on your clear time (< 9s = ★★★, < 18s = ★★, else ★).

Daily (DAILY)

A date-seeded, side-scrolling level assembled fresh each day — every Redditor plays the exact same level on a given day, and it changes completely tomorrow.

• Generated from a library of 10 section types (heavy gates, light gates, bubble walls, seesaws, swap-lifts, spike mazes, moving platforms, block gates, etc.) — each daily draws a random subset for a unique combination.
• Always includes at least one signature hard beat (the seesaw wall and/or spike gauntlet) near the end.
• Sections ramp from easy → hard so the level teaches as it goes.
• Your best time is posted to a per-day leaderboard (top 10 players shown).
• Consecutive daily clears earn a streak shown on the main menu.

Create (CREATE)

Opens the in-game level editor — place any object from the palette (blocks, plates, doors, spikes, moving platforms, swap-lifts, bubbles, seesaws, checkpoints) inside a blank room frame.

• Drag objects to position them, tap to configure their properties (target position for movers/lifts, colour for doors, which plate opens which door).
• Play-Test your puzzle to verify it's solvable — clearing it in play-test mode unlocks Publish.
• Published puzzles become community posts that other Redditors can play.
• Capped at 18 objects (plus the required 2 players and 2 goals).

Leaderboard (LEADERBOARD)

Per-scope leaderboard tracking the fastest times for each scope:

• Each player only keeps their best time per scope — subsequent plays only improve it.
• Leaderboards store the top 10 fastest times.
• Viewed from the in-game 🏆 button (shows top 8) or the main menu LEADERBOARD button (shows top 6 for the current daily).

Progression & streaks

• Campaign progress persists via the server: cleared rooms unlock future ones even if you leave and come back.
• Daily streak grows by 1 each consecutive day you complete the daily. A missed day resets it to 1.
• The main menu shows your current streak + campaign completion count at a glance.

Tech stack

• Phaser 4 — the game client (Arcade physics), rendered in a Devvit web view.
• Vite — bundles the client.
• Hono — server routes (leaderboards, daily post scheduling).
• Devvit Web — the Reddit app platform + hosting.
• TypeScript throughout.

Built With

• devvit
• hono
• phaser.js
• typescript
• vite