How do I build a circle in Minecraft?
Choose the diameter you want, then copy the plan row by row: every dark square is one block. Start at the middle of a side, count blocks along the row, and use the centre line as your guide. Odd diameters (21, 31, 41) have a single centre block, which makes them easier to line up with a doorway or a beacon; even diameters have a centre that falls between four blocks.
What do thin, thick and filled mean?
Thick walls never leave a diagonal gap, so mobs and water cannot slip through: the safest choice for a wall or a pool. Thin walls touch only at the corners and use fewer blocks, which looks cleaner from a distance and suits decoration. Filled gives you the whole disc, for a floor, a roof or a platform.
How do I build a sphere?
A sphere is a stack of circles that grow and then shrink. Pick "Sphere", set the diameter, then move the layer slider from 1 (the bottom) to the top and build one layer at a time. The block count shows the layer you are looking at, so you can gather materials as you climb. For a dome, build only the top half.
Why might my circle differ from another generator's?
Every circle tool has to decide which edge blocks count. This one uses one stated rule: a block is part of the shape when its centre lies inside the ideal circle, worked out in exact whole numbers so the plan never changes between devices. A few edge blocks can differ from other generators that round differently; both are "correct", just different choices.
How big can I go?
Up to 256 blocks across, wider than a full chunk-aligned base. Very large plans are easier to follow if you mark the four extreme points first and fill the arcs between them.