Minecraft: Java Edition · Paper servers · free and open source

Build like you have a hundred hands.

Bayzyl is a building toolkit for Minecraft. Type one command and a dome appears. Paint a forest with a brush. Copy a whole castle and stack ten more. Made a mess? Undo it. Made by Sage Deutschle, a Computer Science student at Ohio State, and running on the server where these builds live.

Explore the builds

100+ commands25+ brushesUndo that survives restartsIn-game help

For builders

What can Bayzyl do?

Everything below is a real command. Every option is written the same way, name:value, and the game finishes typing it for you.

Shapes in one line

Spheres, domes, bowls, pyramids, cylinders. Pick a block and a size, stand where the middle should be, press enter.

/sphere stone 12

Paint with brushes

Bind a brush to the item in your hand: raise hills, smooth cliffs, spatter flowers, grow vegetation, erase mistakes.

/brush paint 5 oak_leaves density:0.3

Copy a whole castle

Select it, copy it, paste it where you are looking. Rotate it, flip it, or stack it into a wall of towers.

/paste at:target

Undo. Always.

Your undo history is yours and it remembers your steps even after the server restarts. Big changes ask you to confirm first.

/undo /oops

Build as a team

Share builder kits with themes and icons, save your favourite spots, and switch loadouts with named profiles. When many people build at once, server time is shared fairly.

/selsave

Help inside the game

A guide you read without leaving the world, plus a tab panel that shows what you have selected.

/bzlhelp

Try it

Your first dome in three steps

Stand in the middle

Walk to where the centre of the dome should be. Bayzyl builds around you.

Type one command

/dome glass 10 gives you a glass dome ten blocks across. Swap glass for any block.

Change your mind

/undo takes it back. /oops takes it back and tells your teammates you did.

Select an image to see it in full.

A glass dome and white pillars on a square stone platform, with a tower and orange ring nearby.

A freestanding gray stone tower with a brown peaked roof on flat grass.

A large upright orange block ring with small trees around it and one on top.

These renders are real Bayzyl commands on a plain Paper server with vanilla textures and no other building plugin installed.

The gallery

A world worth exploring.

Sage's builds on the private server where Bayzyl grew up. Minecraft: Java Edition, with shaders.

17 views. Select any image to step inside.

Waterfront buildings and terraces around a bay under a pink and orange sky.

A tall pale tower beside the water, surrounded by buildings, gardens and trees.

A large pale stepped pyramid with a dark sculpture at its peak, beside a river.

An aerial view of tiled rooftops, gardens and a columned building overlooking the water.

An illuminated columned building above terraced gardens on a rocky cliff at night.

Broad stone steps leading between white sculptures to a columned building at night.

A long columned hall with a checkered floor, red and yellow central strip, and rows of fire bowls.

Tiered buildings and pink blossoming trees around a lantern-lit garden at night.

Illuminated red buildings with dark roofs set into a steep hillside at night.

Lantern-lit timber structures and walkways above a narrow waterway between steep cliffs.

Large dark spacecraft-shaped builds suspended above the water.

A large wall-mounted map of green land, waterways and buildings, surrounded by dark timber.

A close view of the dark fortress walls, towers and bright orange lava.

The dark fortress at night, with glowing lava against the sea and sky.

A bright lava cascade running through a tall dark stone interior.

A small wood-lined room with a dark bed, lanterns, a bookshelf and a wooden door.

An angled aerial view of the fortress walls and courtyard, with purple accents and lava.

For parents, teachers and librarians

A building club that teaches something

Minecraft is where kids already want to be. Bayzyl turns that time into practice with coordinates, geometry, planning, and working on one world as a team.

What students actually learn

3D coordinates and measurement. Every selection is x, y, z. /ruler and /measure make distance real.
Geometry you can walk through. Radius, diameter, symmetry, rotation and mirroring, by building them.
Math as a material. /generate shapes a structure from a formula.
Planning and iteration. Copy, test, undo, try again. Mistakes are cheap and visible.
Teamwork. Shared kits, named spots, and fair turns when the whole class builds at once.

How the server is kept safe

Whitelist only. Nobody joins without being added by name. No public address, no strangers.
Supervision built in. Staff see who is building what and can pause or cancel any job.
Nothing is lost. Per-player undo plus automatic world backups.
Privacy first. Minimal data: a player name and progress. No accounts beyond the Minecraft one the family already owns.
Tested like real software. 547 automated tests and real-server checks run before every release candidate.

Students play on their own Minecraft: Java Edition account (one-time purchase from Microsoft). The club supplies the server, the tools and the curriculum.

In development

Block by Block: lessons inside the game

A course engine that runs on the same server. A lesson is a short file: an objective like "light the lamp", a hint, and what counts as done. The game checks the world, marks progress, and hands out an achievement. Finishing lessons can unlock perks on the club's survival world.

Lessons as files

Teachers write courses without code. /learn starts one, /progress shows where a student is.

Guided and open-ended

Start with a step-by-step build, end with "design a bridge that spans 30 blocks".

Privacy by default

Progress is stored on the club's own server, not a company cloud.

Status today: the engine and the first lesson run on a Paper 26.2 test server. The first classroom pilot is the next milestone.

Who is behind it

Sage Deutschle

Computer Science and Engineering student at The Ohio State University in Columbus. Author of Bayzyl. Co-developed Prismet Arcade, live on the App Store with 19 classic games. Runs a Minecraft network of several servers and builds the tools that keep it running. Scopes honestly and hands over full source.

Bayzyl on GitHub (source, releases, docs) Bayzyl on prismet.xyz Get in touch LinkedIn