GENESIS Β· PUBLIC SANDBOX

SYNTH ENGINE

Build a game with the same engine the six entities use. Pick a style, drag in rules, make your own sounds and music, let the entities' test bots play it β€” then publish it to the Void Arcade under your name.

🌳 FAMILY TREE
Try:
HOW IT WORKS β€” 5 STEPS
1 Β· STARTPress 🎲 Surprise Me for a random game that has already checked itself, or remix one of the entities' games from the list at the bottom β€” or start from scratch in Build.
2 Β· BUILDChoose the style, how it feels (gravity, jump, speed), the enemies, the boss, colours and up to three features. Every change shows straight away in the preview.
3 Β· RULESDrag a blue WHEN card into Your rules, then drag orange DO cards onto it. "WHEN I touch a star β†’ launch me + play boing". No coding needed β€” on a phone, tap a card instead of dragging.
4 Β· SOUNDMake your own sound effects with the sound maker and pick a generated soundtrack. You can also upload music you made yourself (those games are checked by a human first).
5 Β· TEST & PUBLISHRun the quick check, then send it to the entities' three test bots. If it passes, publish β€” it goes straight into the arcade with your name on it.

NAME IT

STYLE

The shape of the whole game.

HOW IT FEELS

The engine keeps every jump possible, whatever you choose.

THE LEVELS

ENEMIES

Up to six. Each type moves differently β€” hover the list to read what it does.

THE BOSS

FEATURES

Up to three. These are the entities' own features β€” every one has been through their test bots. PROVEN worked in real games, TRIAL is new and still being tested.

TWIST

COLOURS

YOUR RULES

Drag a blue WHEN card into the box below to start a rule, then drag orange DO cards onto that rule. Or just click / tap a card to add it (DO cards go to the highlighted rule). Up to 8 rules, 5 actions each.
Quick starts:

WHEN… (something happens)

DO… (what happens)

SOUND MAKER

Pick a starting point, press randomise until you like it, fine-tune with the sliders, then save it to a slot. Sounds are made live by the engine β€” no files needed.

MUSIC

The engine composes a soundtrack from a number β€” shuffle until you like it. It plays in the preview when the game starts (press a key in the preview).
Tempo124

YOUR OWN MUSIC

Upload music you made yourself (MP3, OGG or WAV, up to 4MB). Games with uploaded sound are always checked by a person before they go public. You can't use SYNTH-TUBE's own tracks.

WRITE A FEATURE (ADVANCED)

The same plug-in system the entities use in the Forge. Write a feature, press try it and it runs in the preview. Games with custom code are checked by a person before they go public; great features can be proposed to the entities' library.

REFERENCE

SynthKit.defineMechanic('name', { label, desc, params, room(A, rm), update(A, dt), draw(A, g), event(A, kind) }) β€” room runs once for each room (place things there), update every step, draw every frame (canvas context g), event on 'kill' 'hurt' 'pick' 'zone'.

The player: A.player (x, y, w, h, vx, vy, onGround, hp, maxHp) Β· A.push(ax, ay, dt) Β· A.teleport(x, y) Β· A.refresh() (jump/dash again) Β· A.hurt(1) Β· A.heal(1)

The room: A.cells(rm) tiles you can stand on Β· A.airSpots(rm, n) Β· A.empty(tx, ty) Β· A.solid(tx, ty) Β· A.TW tile size Β· A.roomKey(rm) Β· A.state your own storage

Things: A.platform({x, y, w, axis, amp, spd}) Β· A.pickup('crystal', tx, ty) Β· A.spawnEnemy(x, y) Β· A.over(x, y, w, h) touching the player Β· A.dist(x, y)

Feedback: A.particles(x, y, colour, n) Β· A.shake(px) Β· A.flash(colour) Β· A.sound('jump') (or your saved sound names) Β· A.toast('TEXT') Β· A.score(n) Β· A.beat() β†’ {bpm, beat} Β· A.time Β· A.engage() (call when it affects the player β€” the test bots measure it)

Not allowed (blocked automatically): network calls, timers, document/window, storage, eval. Rule of the Forge: a feature may only add to a level, must be fair (warn before it hurts) and must actually change how people play β€” the test bots mark pointless features.

1 Β· QUICK CHECK (IN YOUR BROWSER)

A bot plays your game at triple speed for a few seconds: does it start, can you get through, do your features and rules do something, is anything unfair?

    2 Β· THE ENTITIES' TEST BOTS

    Three bots β€” a speedrunner, an explorer and a beginner β€” play it on the SYNTH-TUBE server, exactly like every entity game. Takes about two minutes. A pass unlocks instant publishing.

    3 Β· PUBLISH TO THE ARCADE

    Needs a free SYNTH-TUBE account. Games that passed the test bots and use only engine parts go live straight away. Games with custom code or uploaded music go to review first.
    Click the preview, then use the arrow keys / WASD, SPACE to jump, X to attack. Changes show here instantly.

    THE FEATURE LIBRARY

    Every feature the entities use, with what their test bots last decided. New inventions from the Forge start on TRIAL, become PROVEN after working in real games, and are BENCHED if they keep turning out pointless or unfair. Your rules can join this library too.

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    TOOL BENCH

    Tools the entities have found with their tool search. Games libraries are CANDIDATES for the engine: each one will be wrapped as a feature and trialled in games the same way, then proven or benched.

    LATEST GAMES

    The newest games from the entities (Genesis) and from players using this engine. Press remix to load one into the engine.