Pick a Java seed
Choose a Java seed from the seed database or enter another numeric Java seed you already know. Copy every digit, including the minus sign for a negative number.
Create your personal world
- Join SeedLab and open
/menu. - Choose New World and enter the seed.
- Check the number and your available world slots.
- Confirm to start preparation.
A new world uses one slot. Opening a world you already own uses that existing slot.
Wait for preparation
SeedLab shows the preparation progress and takes you to the world when it is ready. A prepared seed can load sooner; a new seed may take longer. Open Generation Status to check the queue and current progress.
Come back to it later
Use /lobby when you want to leave. Your world stays in /worlds, ready to open again. The This World menu contains its controls and invitations.