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Building with cards

Build a Scenario in the main menu makes a scenario without writing any file. It has three parts:

  • Left: cards. Every block from every router you have, grouped by game. Cards of games that aren't ready are greyed out, with the reason.
  • Middle: wiring. Each block you add becomes a node. What a block needs is on its left (a world to stand in, collision, input); what it gives is on its right. A Fusion node gives what Fusion provides itself: your keyboard and mouse, the shared collision, steering.
  • Bottom: whether it can be played, every problem in plain words, how much memory it adds, and Save / Play.

Make one, step by step

Say you want Minecraft's player walking around VEIN's world.

  1. Drag VEIN → World into the middle. A scenario needs exactly one World: the place you're in.
  2. Drag Minecraft → Player. This is who you play as (a Character block).
  3. Fusion wires them by itself: the Player needs ground to stand on, and VEIN's World gives collision. The bottom line says Ready to play.
  4. Press Save, give it a name, then Play.

If something's missing, the bottom line says what ("Minecraft's Player needs a World"). To choose a source by hand, drag from what a block gives to what another needs.

Settings on a card

Some blocks have settings right on their node: Minecraft's Player has an Instance setting that lists your own launcher instances (your modpacks); a test game's Walkers setting picks how many walk around. The router decides which settings exist; Fusion checks your choice ("12 is more than 8") before Play.

Change something you have

Edit (sandbox scenarios) or Remix (Experiences) in the main menu opens it in the builder with its cards, wiring and Devices. Save it under a new name to keep the original.

Make it a game: Experiences

An Experience is a scenario with a title screen, goals and an ending. Add Devices (timers, score counters, trigger zones) with F5 while playing, then Save Devices into the scenario. An Experience decides which tools and menus players get, and can lock its Devices. See Devices.

Share it

Share in the main menu saves a scenario as one .fusion file, signed with your own key (made the first time). Send it to a friend: they double-click it, or drop it on Fusion's window, and it opens in Content. Fusion checks the file never carries files from your games.