What exactly each experiment changes — by files and code of the game itself — and how to enable it in single-player and on a server.
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Line for server.properties — below, what changes each — further
initial-enabled-packs=vanilla,trade_rebalance,minecart_improvements,redstone_experimentsThree experiments in the game. Enable them only when creating a world — they cannot be disabled afterward.
On the server, experiments are enabled by the line initial-enabled-packs in server.properties — it's available in 'Short'. It works only until the first world load. The game warns that experiments may be unstable and worlds with them might not open in future versions.
Villagers trade differently: librarian books depend on the village biome, armor vendors sell different armor in different villages, and loot in chests of certain structures varies.
In-game description: 'Updated farmer trades'. Data pack — trade_rebalance, the code is the trade_rebalance data set.
| Village | Books from level 1 to level 3 | Master |
|---|---|---|
| deserts | Fire Protection, Thorns, Infinity | Efficiency III |
| jungles | Feather Falling, Projectile Protection, Power | Unbreaking II |
| plains | Punch, Smite, Bane of Arthropods | Protection III |
| savannas | Knockback, Curse of Binding, Sweeping Edge | Sharpness III |
| snowy lands | Aqua Affinity, Looting, Frost Walker | Silk Touch |
| swamps | Depth Strider, Respiration, Curse of Vanishing | Mending |
| taigas | Blast Protection, Fire Aspect, Flame | Fortune II |
| Village | Armor |
|---|---|
| taigas | Diamond |
| jungles | hemp |
| swamps | hemp |
| deserts | Diamond, Iron |
| plains | Diamond, Iron |
| savannas | Diamond, Iron |
| snowy lands | Diamond, Iron |
| Construction | Added | Removed |
|---|---|---|
| Mineshaft | Book «Efficiency» | — |
| Ancient City | Book «Mending», Saddle | Leather |
| Desert pyramid | Book «Unbreaking», Saddle | Leather |
| Jungle pyramid | Book «Unbreaking», Saddle | Leather |
| Pillager Outpost | Book «Quick Charge» | — |
Minecarts now follow new movement rules, and a game rule called max_minecart_speed has been introduced — the maximum speed limit for minecarts.
In-game description: 'Improved minecart movement'. Data pack — minecart_improvements, the code is NewMinecartBehavior instead of OldMinecartBehavior.
Ceiling sets the rule max_minecart_speed: default is 8, can be from 1 to 1000. This rule has no experiment in the game.
Redstone wire is considered a new method, and adjacent blocks detect from which side the change came. The order of activation changes, and schematics designed for the old order may behave differently.
In-game description: 'Experimental redstone changes'. Data pack — redstone_experiments, the code is ExperimentalRedstoneWireEvaluator instead of DefaultRedstoneWireEvaluator.
When creating a world: go to the 'Other' tab → 'Experiments', check the desired options and click 'Done'. Experiments cannot be enabled in an already created world, and once enabled, they cannot be disabled.
In version 26.3, 3: "Trade balance with farmers", "Minecart improvements", "Nether Star changes".
In server.properties before first world launch: initial-enabled-packs=vanilla,trade_rebalance,minecart_improvements,redstone_experiments.
All wiki content Key initial-enabled-packsGenerator: server.properties configMinecraft Generator: Villager Trade Generator
Minecraft 26.3 data: files, tags, structure templates, and client code — the build checks every number against the game itself, not memory.
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