spriteloom

Rule Cabinet

Edit the laws of a physics toybox as swappable cards, then share each result as a tiny playable experiment.

37% of Mod support Sandbox games found an audience, yet few came out lately. 43 of 101 judged games reached 1,000 reviews, and 39 came out in the last three years.

What it feels like

You feel like a mad lab keeper who rewrites how the world works and watches the fallout.

The core loop

  • Pick: Choose a starting scene with a handful of objects and a goal, like getting a ball to a switch.
  • Swap: Drop rule cards for gravity, friction or time into the cabinet slots.
  • Run: Watch the physics play out and nudge objects mid-run.
  • Share: Package the scene and its rule cards as a small experiment others can open and remix.

One sitting

You solve or break a few set scenes, then spend the rest of the sitting building and posting one experiment of your own. Playing a friend's experiment takes a couple of minutes.

What sets it apart

  • Rules are the thing you edit, not just objects, which sets it apart from Brick Rigs and Solar 2.
  • Experiments can be played together with a friend, since multiplayer goes with hits in this space.
  • Shared experiments are rule cards and data only, with no scripts or code, so the mod workshop stays safe, which players of People Playground have asked for.

The first playable

One room with a few boxes and balls, three rule cards (gravity, friction, time) and a run button. Prove that swapping a card makes the same scene feel very different.

Scope

  • One physics scene with a dozen object types
  • Three rule cards with sliders
  • Run, pause and reset controls
  • Around a dozen rule cards
  • Goal scenes with a simple star rating
  • Share and browse experiments via the Steam Workshop
  • Data-only experiment files

Art

Flat, chunky shapes with bold colors and a clean lab-cabinet UI. Rule cards with big icons make a clear capsule image.

Risks

  • Physics-heavy scenes can run badly on modest machines. Cap object counts, add a simulation quality setting, and test on a low-end PC early.
  • Unsafe workshop content has hurt trust in moddable sandboxes. Allow only data files, never code, and review how uploads load before opening the workshop.
  • Many misses lean on a level editor, so a build-your-own-levels tool alone does not carry a game. Make the rule cards the core play, and keep scene building simple.

Price

$10 to $20: Games in this band found an audience more often than cheaper ones, and a small physics toybox fits here without the pricing of bigger sandboxes.

Mod support Sandbox games that found an audience

The other idea

Little Harbor Mods

More room