diff --git a/examples/genmaps/genmaps.go b/examples/genmaps/genmaps.go
index e275f05..07f31b4 100644
--- a/examples/genmaps/genmaps.go
+++ b/examples/genmaps/genmaps.go
@@ -186,7 +186,6 @@ func drawSection(s *save.Chunk, img *image.RGBA) {
 		return
 	}
 	// decode section
-	//bpb := int(math.Max(4, math.Ceil(math.Log2(float64(len(s.Palette))))))
 
 	// decode status
 	data := *(*[]uint64)(unsafe.Pointer(&s.BlockStates)) // convert []int64 into []uint64
diff --git a/save/chunk_test.go b/save/chunk_test.go
index faad19a..9ea7004 100644
--- a/save/chunk_test.go
+++ b/save/chunk_test.go
@@ -1,9 +1,13 @@
 package save
 
 import (
+	"bytes"
+	"github.com/Tnze/go-mc/data/packetid"
+	pk "github.com/Tnze/go-mc/net/packet"
 	"github.com/Tnze/go-mc/save/region"
 	"math/rand"
 	"testing"
+	"unsafe"
 )
 
 func TestColumn(t *testing.T) {
@@ -51,3 +55,69 @@ func BenchmarkColumn_Load(b *testing.B) {
 		}
 	}
 }
+
+func ExampleColumn_send() {
+	r, err := region.Open("/path/to/r.0.0.mca")
+	if err != nil {
+		panic(err)
+	}
+	chunkPos := [2]int{0, 0}
+	data, err := r.ReadSector(chunkPos[0], chunkPos[1])
+	if err != nil {
+		panic(err)
+	}
+
+	var c Column
+	if err := c.Load(data); err != nil {
+		panic(err)
+	}
+
+	var buf bytes.Buffer
+	var PrimaryBitMask pk.VarInt
+	for _, v := range c.Level.Sections {
+		if int8(v.Y) >= 0 && int8(v.Y) < 16 {
+			PrimaryBitMask |= 1 << v.Y
+
+			bpb := len(v.BlockStates) * 64 / (16 * 16 * 16)
+			hasPalette := pk.Boolean(bpb >= 9)
+			paletteLength := pk.VarInt(len(v.Palette))
+			dataArrayLength := pk.VarInt(len(v.BlockStates))
+			dataArray := (*[]pk.Long)(unsafe.Pointer(&v.BlockStates))
+			_, err := pk.Tuple{
+				pk.Short(0),          // Block count
+				pk.UnsignedByte(bpb), // Bits Per Block
+				pk.Opt{
+					Has: &hasPalette,
+					Field: pk.Ary{
+						Len: &paletteLength,
+						Ary: nil, // TODO: We need translate v.Palette (with type of []Block) to state ID
+					},
+				}, // Palette
+				pk.Ary{Len: &dataArrayLength, Ary: dataArray}, // Data Array
+			}.WriteTo(&buf)
+			if err != nil {
+				panic(err)
+			}
+		}
+	}
+
+	size := pk.VarInt(buf.Len())
+	bal := pk.VarInt(len(c.Level.Biomes))
+	_ = pk.Marshal(
+		packetid.WorldParticles,
+		pk.Int(chunkPos[0]),        // Chunk X
+		pk.Int(chunkPos[1]),        // Chunk Y
+		pk.Boolean(true),           // Full chunk
+		PrimaryBitMask,             // PrimaryBitMask
+		pk.NBT(c.Level.Heightmaps), // Heightmaps
+		pk.Ary{
+			Len: &bal,           // Biomes array length
+			Ary: c.Level.Biomes, // Biomes
+		},
+		pk.Ary{
+			Len: &size,                     // Size
+			Ary: pk.ByteArray(buf.Bytes()), // Data
+		},
+		pk.VarInt(0), // Block entities array length
+	)
+}
diff --git a/save/palette.go b/save/palette.go
index 3552633..8be70db 100644
--- a/save/palette.go
+++ b/save/palette.go
@@ -1,9 +1,10 @@
 package save
 
 import (
+	"io"
+
 	"github.com/Tnze/go-mc/nbt"
 	pk "github.com/Tnze/go-mc/net/packet"
-	"io"
 )
 
 type BlockState interface {