diff --git a/examples/frameworkServer/main.go b/examples/frameworkServer/main.go
index 7123897..72a0131 100644
--- a/examples/frameworkServer/main.go
+++ b/examples/frameworkServer/main.go
@@ -32,7 +32,7 @@ func main() {
 	s := server.Server{
 		ListPingHandler: serverInfo,
 		LoginHandler: &server.MojangLoginHandler{
-			OnlineMode: true,
+			OnlineMode: false,
 			Threshold:  256,
 		},
 		GamePlay: &server.Game{
diff --git a/save/chunk.go b/save/chunk.go
index 46356a6..a1f4256 100644
--- a/save/chunk.go
+++ b/save/chunk.go
@@ -11,42 +11,36 @@ import (
 
 // Column is 16* chunk
 type Column struct {
-	DataVersion int
-	Level       struct {
-		Heightmaps map[string][]int64
-		Structures struct {
-			References map[string][]int64
-			Starts     map[string]struct {
-				ID string `nbt:"id"`
-			}
-		}
-		// Entities
-		// LiquidTicks
-		// PostProcessing
-		Sections []Chunk
-		// TileEntities
-		// TileTicks
-		InhabitedTime int64
-		IsLightOn     byte `nbt:"isLightOn"`
-		LastUpdate    int64
-		Status        string
-		PosX          int32 `nbt:"xPos"`
-		PosZ          int32 `nbt:"zPos"`
-		Biomes        []int32
+	DataVersion   int32
+	XPos          int32          `nbt:"xPos"`
+	YPos          int32          `nbt:"yPos"`
+	ZPos          int32          `nbt:"zPos"`
+	BlockEntities nbt.RawMessage `nbt:"block_entities"`
+	Structures    nbt.RawMessage `nbt:"structures"`
+	Heightmaps    struct {
+		MotionBlocking         []int64 `nbt:"MOTION_BLOCKING"`
+		MotionBlockingNoLeaves []int64 `nbt:"MOTION_BLOCKING_NO_LEAVES"`
+		OceanFloor             []int64 `nbt:"OCEAN_FLOOR"`
+		WorldSurface           []int64 `nbt:"WORLD_SURFACE"`
 	}
+	Sections []struct {
+		Y           byte
+		BlockStates struct {
+			Palette []BlockState `nbt:"palette"`
+			Data    []int64      `nbt:"data"`
+		} `nbt:"block_states"`
+		Biomes struct {
+			Palette []string `nbt:"palette"`
+			Data    []int64  `nbt:"data"`
+		} `nbt:"biomes"`
+		SkyLight   []byte
+		BlockLight []byte
+	} `nbt:"sections"`
 }
 
-type Chunk struct {
-	Palette     []Block
-	Y           byte
-	BlockLight  []byte
-	BlockStates []int64
-	SkyLight    []byte
-}
-
-type Block struct {
+type BlockState struct {
 	Name       string
-	Properties map[string]interface{}
+	Properties nbt.RawMessage
 }
 
 // Load read column data from []byte
diff --git a/save/chunk_test.go b/save/chunk_test.go
index 386dac8..498b7b9 100644
--- a/save/chunk_test.go
+++ b/save/chunk_test.go
@@ -6,18 +6,17 @@ import (
 )
 
 func TestColumn(t *testing.T) {
-	var c Column
 	r, err := region.Open("testdata/region/r.0.0.mca")
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer r.Close()
 
+	var c Column
 	data, err := r.ReadSector(0, 0)
 	if err != nil {
 		t.Fatal(err)
 	}
-
 	err = c.Load(data)
 	if err != nil {
 		t.Fatal(err)
@@ -36,10 +35,13 @@ func BenchmarkColumn_Load(b *testing.B) {
 	defer r.Close()
 
 	for i := 0; i < b.N; i++ {
-		x, y := (i%1024)/32, (i%1024)%32
-		//x, y := rand.Intn(32), rand.Intn(32)
+		x, z := (i%1024)/32, (i%1024)%32
+		//x, z := rand.Intn(32), rand.Intn(32)
+		if !r.ExistSector(x, z) {
+			continue
+		}
 
-		data, err := r.ReadSector(x, y)
+		data, err := r.ReadSector(x, z)
 		if err != nil {
 			b.Fatal(err)
 		}
diff --git a/save/region/mca.go b/save/region/mca.go
index bd23b63..7c1e22a 100644
--- a/save/region/mca.go
+++ b/save/region/mca.go
@@ -121,8 +121,8 @@ func sectorLoc(offset int32) (sec, num int32) {
 }
 
 // ReadSector find and read the Chunk data from region
-func (r *Region) ReadSector(x, y int) (data []byte, err error) {
-	offset, _ := sectorLoc(r.offsets[x][y])
+func (r *Region) ReadSector(x, z int) (data []byte, err error) {
+	offset, _ := sectorLoc(r.offsets[x][z])
 
 	if offset == 0 {
 		return nil, errors.New("sector not exist")
diff --git a/save/testdata/DIM-1/data/raids.dat b/save/testdata/DIM-1/data/raids.dat
new file mode 100644
index 0000000..4100fe4
Binary files /dev/null and b/save/testdata/DIM-1/data/raids.dat differ
diff --git a/save/testdata/DIM-1/data/raids_nether.dat b/save/testdata/DIM-1/data/raids_nether.dat
deleted file mode 100644
index d03c17e..0000000
Binary files a/save/testdata/DIM-1/data/raids_nether.dat and /dev/null differ
diff --git a/save/testdata/DIM1/data/raids_end.dat b/save/testdata/DIM1/data/raids_end.dat
index d03c17e..4100fe4 100644
Binary files a/save/testdata/DIM1/data/raids_end.dat and b/save/testdata/DIM1/data/raids_end.dat differ
diff --git a/save/testdata/advancements/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json b/save/testdata/advancements/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json
index 0d9008a..68cdfde 100644
--- a/save/testdata/advancements/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json
+++ b/save/testdata/advancements/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json
@@ -1,9 +1,9 @@
 {
   "minecraft:adventure/adventuring_time": {
     "criteria": {
-      "minecraft:plains": "2019-07-31 15:56:59 +0800"
+      "minecraft:forest": "2021-12-19 20:04:35 +0800"
     },
     "done": false
   },
-  "DataVersion": 1976
+  "DataVersion": 2865
 }
\ No newline at end of file
diff --git a/save/testdata/data/raids.dat b/save/testdata/data/raids.dat
index d03c17e..4100fe4 100644
Binary files a/save/testdata/data/raids.dat and b/save/testdata/data/raids.dat differ
diff --git a/save/testdata/entities/r.-1.-1.mca b/save/testdata/entities/r.-1.-1.mca
new file mode 100644
index 0000000..6dc42c9
Binary files /dev/null and b/save/testdata/entities/r.-1.-1.mca differ
diff --git a/save/testdata/entities/r.-1.0.mca b/save/testdata/entities/r.-1.0.mca
new file mode 100644
index 0000000..2e8f840
Binary files /dev/null and b/save/testdata/entities/r.-1.0.mca differ
diff --git a/save/testdata/entities/r.0.-1.mca b/save/testdata/entities/r.0.-1.mca
new file mode 100644
index 0000000..51c5c38
Binary files /dev/null and b/save/testdata/entities/r.0.-1.mca differ
diff --git a/save/testdata/entities/r.0.0.mca b/save/testdata/entities/r.0.0.mca
new file mode 100644
index 0000000..efa7e1a
Binary files /dev/null and b/save/testdata/entities/r.0.0.mca differ
diff --git a/save/testdata/icon.png b/save/testdata/icon.png
new file mode 100644
index 0000000..04b60be
Binary files /dev/null and b/save/testdata/icon.png differ
diff --git a/save/testdata/level.dat b/save/testdata/level.dat
index 6c3f785..e914193 100644
Binary files a/save/testdata/level.dat and b/save/testdata/level.dat differ
diff --git a/save/testdata/level.dat_old b/save/testdata/level.dat_old
index e9c59e8..5e10b4b 100644
Binary files a/save/testdata/level.dat_old and b/save/testdata/level.dat_old differ
diff --git a/save/testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat b/save/testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat
index eac67ea..4ac425e 100644
Binary files a/save/testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat and b/save/testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat differ
diff --git a/save/testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat_old b/save/testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat_old
new file mode 100644
index 0000000..4ac425e
Binary files /dev/null and b/save/testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat_old differ
diff --git a/save/testdata/poi/r.-1.-1.mca b/save/testdata/poi/r.-1.-1.mca
new file mode 100644
index 0000000..ff5b6f7
Binary files /dev/null and b/save/testdata/poi/r.-1.-1.mca differ
diff --git a/save/testdata/poi/r.0.-1.mca b/save/testdata/poi/r.0.-1.mca
new file mode 100644
index 0000000..cf2f1a7
Binary files /dev/null and b/save/testdata/poi/r.0.-1.mca differ
diff --git a/save/testdata/poi/r.0.0.mca b/save/testdata/poi/r.0.0.mca
new file mode 100644
index 0000000..2ca3870
Binary files /dev/null and b/save/testdata/poi/r.0.0.mca differ
diff --git a/save/testdata/region/r.-1.-1.mca b/save/testdata/region/r.-1.-1.mca
index c6f670d..528e7fe 100644
Binary files a/save/testdata/region/r.-1.-1.mca and b/save/testdata/region/r.-1.-1.mca differ
diff --git a/save/testdata/region/r.-1.0.mca b/save/testdata/region/r.-1.0.mca
index 642e0ec..81e7967 100644
Binary files a/save/testdata/region/r.-1.0.mca and b/save/testdata/region/r.-1.0.mca differ
diff --git a/save/testdata/region/r.0.-1.mca b/save/testdata/region/r.0.-1.mca
index 25e5d10..5964776 100644
Binary files a/save/testdata/region/r.0.-1.mca and b/save/testdata/region/r.0.-1.mca differ
diff --git a/save/testdata/region/r.0.0.mca b/save/testdata/region/r.0.0.mca
index bb36bb0..829f3bb 100644
Binary files a/save/testdata/region/r.0.0.mca and b/save/testdata/region/r.0.0.mca differ
diff --git a/save/testdata/session.lock b/save/testdata/session.lock
index 03394fd..0d7e5f8 100644
Binary files a/save/testdata/session.lock and b/save/testdata/session.lock differ
diff --git a/save/testdata/stats/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json b/save/testdata/stats/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json
index 460c316..4da5ab7 100644
--- a/save/testdata/stats/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json
+++ b/save/testdata/stats/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json
@@ -1 +1 @@
-{"stats":{"minecraft:custom":{"minecraft:time_since_rest":6,"minecraft:play_one_minute":6,"minecraft:leave_game":1,"minecraft:time_since_death":6}},"DataVersion":1976}
\ No newline at end of file
+{"stats":{"minecraft:custom":{"minecraft:time_since_rest":14,"minecraft:leave_game":1,"minecraft:play_time":14,"minecraft:time_since_death":14,"minecraft:total_world_time":77}},"DataVersion":2865}
\ No newline at end of file
diff --git a/server/dimension.go b/server/dimension.go
index 181328d..542c032 100644
--- a/server/dimension.go
+++ b/server/dimension.go
@@ -152,7 +152,7 @@ func (s *SimpleDim) LoadChunk(pos ChunkPos, c *Chunk) {
 func (s *SimpleDim) Info() DimInfo {
 	return DimInfo{
 		Name:       "minecraft:overworld",
-		HashedSeed: 0,
+		HashedSeed: 1234567,
 	}
 }