Minecraft

Save Data

Save Data on Windows is located here:

%LocalAppData%\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds

For Java Edition:

%APPDATA%\.minecraft\saves

Technical Details

World Generation

Seed: 64-bit integer that determines world generation
Chunks: 16x16 block sections, loaded/unloaded dynamically
World Height: -64 to 320 blocks (1.18+), total height of 384 blocks
Bedrock Layer: Y=-64 (bottom of world)
Build Limit: Y=320 (top of world)

Performance & Optimization

JVM Arguments for Java Edition

java -Xmx4G -Xms4G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1

Server Properties Optimization

# server.properties
view-distance=10
simulation-distance=10
max-tick-time=60000
spawn-protection=0
enable-command-block=false
enforce-whitelist=true

NBT Data Format

Minecraft uses Named Binary Tag (NBT) format for data storage:

TAG_Byte: Single signed byte
TAG_Short: Signed 16-bit integer
TAG_Int: Signed 32-bit integer
TAG_Long: Signed 64-bit integer
TAG_Float: IEEE 754 single precision
TAG_Double: IEEE 754 double precision
TAG_String: UTF-8 string
TAG_List: List of unnamed tags
TAG_Compound: List of named tags

Redstone Engineering

Signal Strength

Power Level: 0-15 (redstone dust weakens by 1 every block)
Maximum Range: 15 blocks without repeater
Repeater Delay: 1-4 redstone ticks (0.1-0.4 seconds)

Logic Gates

NOT Gate: Redstone torch + block
AND Gate: Two inputs into single output
OR Gate: Multiple inputs merged
XOR Gate: Combination of AND/OR/NOT gates

Server Administration

Essential Commands

# Performance monitoring
/tps                    # Server TPS (20 = perfect)
/lag                    # Check server lag
/mspt                   # Milliseconds per tick

# World management
/gamerule randomTickSpeed 3    # Default tick speed
/gamerule doDaylightCycle false # Stop time
/weather clear 1000000         # Clear weather

# Backup
/save-all              # Force save all chunks
/save-off              # Disable auto-save
/save-on               # Enable auto-save

Security

# Prevent griefing
spawn-protection=16
enable-command-block=false
broadcast-rcon-to-ops=false

# Performance protection
max-players=20
rate-limit=0
max-world-size=29999984

Useful Tools

MCA Selector: Edit region files directly
NBTExplorer: View/edit NBT data
Chunky: Pre-generate world chunks
WorldEdit: In-game world editing
Litematica: Schematic mod for building

Creative Mode Cheat Codes

Basic Cheats

# Game Mode Changes
/gamemode creative          # Switch to creative mode
/gamemode survival          # Switch to survival mode
/gamemode spectator         # Switch to spectator mode
/gamemode adventure         # Switch to adventure mode

# Time & Weather
/time set day               # Set time to day (1000)
/time set noon              # Set time to noon (6000)
/time set night             # Set time to night (13000)
/time set midnight          # Set time to midnight (18000)
/weather clear              # Clear weather
/weather rain               # Make it rain
/weather thunder            # Make it storm

# Player Management
/heal                       # Heal to full health
/feed                       # Fill hunger bar
/fly                        # Toggle flight mode
/god                        # Toggle god mode (invincibility)
/give @p minecraft:diamond 64    # Give 64 diamonds
/xp add @p 1000             # Add 1000 XP points

# World Manipulation
/fill ~-5 ~-1 ~-5 ~5 ~-1 ~5 minecraft:glass    # Create glass platform
/setblock ~ ~-1 ~ minecraft:bedrock             # Place bedrock below you
/clone 0 0 0 10 10 10 20 20 20                 # Copy area
/tp @p 0 100 0              # Teleport to coordinates
/tp @p ~ ~10 ~              # Teleport 10 blocks up

Advanced Cheats

# Enchanted Items
/give @p minecraft:diamond_sword{Enchantments:[{id:"sharpness",lvl:32767}]}
/give @p minecraft:bow{Enchantments:[{id:"infinity",lvl:1},{id:"power",lvl:10}]}
/give @p minecraft:elytra{Enchantments:[{id:"unbreaking",lvl:10}]}

# Mob Spawning
/summon minecraft:zombie ~ ~ ~ {IsBaby:1b}      # Spawn baby zombie
/summon minecraft:horse ~ ~ ~ {Tame:1b}         # Spawn tamed horse
/summon minecraft:villager ~ ~ ~ {Profession:librarian}  # Spawn librarian

# World Generation
/locate structure minecraft:stronghold          # Find nearest stronghold
/locate biome minecraft:mushroom_fields         # Find mushroom island
/forceload add ~ ~                              # Keep chunk loaded

Block Functions & Hidden Mechanics

Fishing Mechanics

How to Fish Effectively

Requirements:
- Fishing rod
- Water source (1x1 minimum, 2 blocks deep optimal)
- Patience and timing

Technique:
1. Cast line into water (right-click)
2. Watch for bobber to go underwater
3. Listen for splash sound
4. Right-click immediately when bobber dips
5. Items will fly toward you

Fishing Loot Tables

Fish: 85% chance (cod, salmon, tropical fish, pufferfish)
Treasure: 5% chance (enchanted books, name tags, saddles, nautilus shells)
Junk: 10% chance (leather boots, bowls, sticks, string)

Fishing Enchantments

Luck of the Sea: Increases treasure chance
Lure: Decreases time between catches
Unbreaking: Increases rod durability

Portal Creation

Nether Portal

Materials: 14 obsidian blocks (minimum 10)
Size: 4x5 frame (can be larger up to 23x23)
Activation: Flint and steel or fire charge

Construction:
1. Build rectangular frame of obsidian
2. Light the inside with flint and steel
3. Purple particles = active portal

End Portal

Materials: 12 Eyes of Ender
Location: Must find stronghold first
Process:
1. Find stronghold using Eyes of Ender
2. Locate portal room
3. Fill empty frame slots with Eyes of Ender
4. Portal activates automatically when complete

Portal between two coordinates

Give yourself a command block

/give @p command_block

Place the command block (behind or under your portal frame).

Enter this command

execute as @p[x=PORTALX,y=PORTALY,z=PORTALZ,distance=..2] run tp @s DESTX DESTY DESTZ

Adjust coordinates:

PORTALX/Y/Z = coordinates of the portal
DESTX/Y/Z = coordinates where you want to teleport

Set the command block

Block Type: Repeat
Condition: Always Active

Build a second portal the same way to teleport back

Advanced Block Mechanics

Redstone Components

Comparator Functions:

Compare Mode: Outputs signal strength comparison
Subtract Mode: Subtracts side input from main input
Container Reading: Outputs signal based on fullness

Observer Block:

Detects block updates in front of it
Outputs 1-tick pulse
Can detect block state changes, not just placement

Water Mechanics

Water Logging:

Stairs, slabs, fences can hold water
Allows complex water features
Prevents water flow while maintaining water block

Bubble Columns:

Soul Sand: Creates upward bubble column (lifts entities)
Magma Block: Creates downward bubble column (pulls entities down)
Must have water source block above

Honey Block Properties

Sticky Movement: Moves adjacent blocks when pushed
Slide Prevention: Prevents fall damage and slows movement
Redstone Power: Doesn't conduct redstone signals
Jump Reduction: Reduces jump height by half

Scaffolding Mechanics

Dynamic Support: Breaks if no horizontal support within 6 blocks
Climbing: Can climb by looking up while moving
Bottom-up Breaking: Breaks from bottom automatically
Side Placement: Can be placed on sides of other scaffolding

Hidden Block Interactions

Cauldron Uses

- Store water, lava, or powder snow
- Clean leather armor (removes dye)
- Fill bottles and buckets
- Extinguish fire on entities
- Clean banners (removes patterns)
- Clean shulker boxes (removes dye)

Composter Mechanics

Compostable Items (by percentage):
- 30%: Seeds, saplings, leaves
- 50%: Flowers, crops, cactus
- 65%: Baked potato, bread, cookies
- 85%: Hay bales, nether wart blocks
- 100%: Pumpkin pie, cake

Bell Functions

Raid Detection: Highlights nearby raiders when rung
Villager Gathering: Calls villagers to nearby area
Schedule: Villagers gather at bells during certain times
Redstone: Can be activated with redstone signal

Lectern Features

Book Storage: Holds written books and book & quill
Page Reading: Right-click to read, use scroll wheel for pages
Redstone Output: Emits signal based on current page
Comparator Compatible: Signal strength = page number

Creative Building Tricks

Invisible Item Frames

/give @p minecraft:item_frame{EntityTag:{Invisible:1b}}

Custom Player Heads

/give @p minecraft:player_head{SkullOwner:"PlayerName"}

Barrier Blocks

/give @p minecraft:barrier    # Invisible, unbreakable blocks

Structure Blocks

Save Mode: Save structures to files
Load Mode: Load saved structures
Corner Mode: Mark structure boundaries
Data Mode: Function execution