Is this the official PrismCraft site?

No. Official playable build is on itch.io.

Is PrismCraft a Minecraft modpack?

No. It is a standalone HTML5 prototype. Unrelated to Prism Launcher and to Minecraft servers named PrismCraft.

https://lairhisson.itch.io/prismcraft

No. Browser on itch, or the zip.

PrismCraft

LAirHisson's HTML5 prototype on itch.io. Minecraft-like, but every block is a triangular prism — not a cube.

Play on itch.io

What PrismCraft is

PrismCraft is LAirHisson's itch.io HTML5 prototype: a Minecraft-like sandbox where every block is a triangular prism, not a cube. This unofficial guide does not host the game and does not ship a clone.

The official playable build is the browser HTML5 prototype on itch.io. You can also download Build Prismcraft 0.3.zip from that page.

Where to play

Play on the official itch.io page. For install steps see How to play PrismCraft. For the geometry see Minecraft but triangles.

What PrismCraft is not

Not a Minecraft modpack, not Prism Launcher, not play.prismcraft.online, and not a vanilla “build a triangle out of cubes” tutorial.

FAQ

Is this the official PrismCraft site?: No. Official playable build is on itch.io.
Is PrismCraft a Minecraft modpack?: No. It is a standalone HTML5 prototype. Unrelated to Prism Launcher and to Minecraft servers named PrismCraft.
Where do I play?: https://lairhisson.itch.io/prismcraft
Do I need Minecraft?: No. Browser on itch, or the zip.