diff --git a/doc/en/block-properties.md b/doc/en/block-properties.md
index 72a4b4c48..f3137dd60 100644
--- a/doc/en/block-properties.md
+++ b/doc/en/block-properties.md
@@ -241,6 +241,15 @@ Number of block inventory slots. Default - 0 (no inventory).
 
 Array of three integers. Default value is `[1, 1, 1]`.
 
+### *grounding-behaviour*
+
+Defines the behavior of the extended grounded block. Available behavior options:
+
+- "partial" - at least one segment must be grounded (default)
+- "complete" - all segments must be grounded
+- "origin" - origin segment must be grounded
+
+
 ## Block fields
 
 Block fields allow you to write more data unique to a specified voxel than the user bits allow.
diff --git a/doc/ru/block-properties.md b/doc/ru/block-properties.md
index 97e8fedc6..50bd7f023 100644
--- a/doc/ru/block-properties.md
+++ b/doc/ru/block-properties.md
@@ -247,6 +247,14 @@
 
 Массив из трех целых чисел. Значение по-умолчанию - `[1, 1, 1]`.
 
+### Поведение приземленности - *grounding-behaviour*
+
+Определяет поведение расширенного приземленного блока. Доступные варианты поведения:
+
+- "partial" - как минимум один сегмент блока должен быть приземленным (по-умолчанию)
+- "complete" - все сегменты блока должны быть приземленными
+- "origin" - главный сегмент должен быть приземленным
+
 ## Поля блока
 
 Поля блоков позволяет записывать больше уникальных для конкретного блока данных, чем это позволяют пользовательские биты.
diff --git a/src/content/loading/BlockLoader.cpp b/src/content/loading/BlockLoader.cpp
index c4df790c6..d9bb5e536 100644
--- a/src/content/loading/BlockLoader.cpp
+++ b/src/content/loading/BlockLoader.cpp
@@ -206,6 +206,15 @@ template<> void ContentUnitLoader<Block>::loadUnit(
             def.defaults.model.type = BlockModelType::AABB;
             def.hitboxes = {AABB(def.size)};
         }
+
+        // grounding behaviour
+        if (root.has("grounding-behaviour")) {
+            std::string groundingBehaviourName = GroundingBehaviourMeta.getNameString(def.groundingBehaviour);
+            root.at("grounding-behaviour").get(groundingBehaviourName);
+            if (!GroundingBehaviourMeta.getItem(groundingBehaviourName, def.groundingBehaviour)) {
+                logger.error() << "unknown grounding behaviour: " << groundingBehaviourName;
+            }
+        }
     }
 
     // primitive properties
diff --git a/src/logic/BlocksController.cpp b/src/logic/BlocksController.cpp
index 1e3ad2441..46c27ec7f 100644
--- a/src/logic/BlocksController.cpp
+++ b/src/logic/BlocksController.cpp
@@ -106,10 +106,17 @@ void BlocksController::updateBlock(int x, int y, int z) {
     if (vox == nullptr) return;
     const auto& def = level.content.getIndices()->blocks.require(vox->id);
     if (def.grounded) {
-        const auto& vec = get_ground_direction(def, vox->state.rotation);
-        if (!blocks_agent::is_solid_at(chunks, x + vec.x, y + vec.y, z + vec.z)) {
-            breakBlock(nullptr, def, x, y, z);
-            return;
+        if (def.rt.extended) {
+            auto origin = blocks_agent::seek_origin(chunks, {x, y, z}, def, vox->state);
+            if (!blocks_agent::check_grounding(chunks, def, vox->state.rotation, origin)) {
+                breakBlock(nullptr, def, origin.x, origin.y, origin.z);
+                return;
+            }
+        } else {
+            if (!blocks_agent::check_grounding(chunks, def, vox->state.rotation, {x, y, z})) {
+                breakBlock(nullptr, def, x, y, z);
+                return;
+            }        
         }
     }
     if (def.rt.funcsset.update) {
diff --git a/src/logic/PlayerController.cpp b/src/logic/PlayerController.cpp
index 17c4fe23f..2e6e6e7e2 100644
--- a/src/logic/PlayerController.cpp
+++ b/src/logic/PlayerController.cpp
@@ -22,6 +22,7 @@
 #include "scripting/scripting.hpp"
 #include "settings.hpp"
 #include "voxels/Block.hpp"
+#include "voxels/blocks_agent.hpp"
 #include "voxels/Chunks.hpp"
 #include "voxels/voxel.hpp"
 #include "window/Camera.hpp"
@@ -448,10 +449,7 @@ void PlayerController::processRightClick(
         return;
     }
     if (def.grounded) {
-        const auto& vec = get_ground_direction(def, state.rotation);
-        if (!chunks.isSolidBlock(
-                coord.x + vec.x, coord.y + vec.y, coord.z + vec.z
-            )) {
+        if (!blocks_agent::check_grounding(chunks, def, state.rotation, coord)) {
             return;
         }
     }
diff --git a/src/voxels/Block.hpp b/src/voxels/Block.hpp
index e1a68c28f..5ba3bb267 100644
--- a/src/voxels/Block.hpp
+++ b/src/voxels/Block.hpp
@@ -140,6 +140,22 @@ VC_ENUM_METADATA(CullingMode)
     {"disabled", CullingMode::DISABLED},
 VC_ENUM_END
 
+/// @brief Grounding behaviour for extended blocks
+enum class GroundingBehaviour : uint8_t {
+    /// @brief at least one segment must be grounded
+    PARTIAL,
+    /// @brief all segments must be grounded
+    COMPLETE,
+    /// @brief origin segment must be grounded
+    ORIGIN
+};
+
+VC_ENUM_METADATA(GroundingBehaviour)
+    {"partial", GroundingBehaviour::PARTIAL},
+    {"complete", GroundingBehaviour::COMPLETE},
+    {"origin", GroundingBehaviour::ORIGIN},
+VC_ENUM_END
+
 /// @brief Common kit of block properties applied to groups of blocks
 struct BlockMaterial : Serializable {
     std::string name;
@@ -239,6 +255,9 @@ public:
     /// @brief Explicitly overriding 'solid' property if true assigned
     bool explictlySolid = false;
 
+    /// @brief Grounding behaviour
+    GroundingBehaviour groundingBehaviour = GroundingBehaviour::PARTIAL;
+
     /// @brief Set of block physical hitboxes
     std::vector<AABB> hitboxes {AABB()};
 
diff --git a/src/voxels/blocks_agent.hpp b/src/voxels/blocks_agent.hpp
index 9ffac7f93..a8131e820 100644
--- a/src/voxels/blocks_agent.hpp
+++ b/src/voxels/blocks_agent.hpp
@@ -494,4 +494,57 @@ inline const AABB* is_obstacle_at(const Storage& chunks, float x, float y, float
     return nullptr;
 }
 
+/// @brief Check block grounding
+/// @tparam Storage chunks storage class
+/// @param chunks chunks storage
+/// @param def block definition
+/// @param rotationIndex target block rotation index
+/// @param origin target block origin
+/// @return true if grounded
+template <class Storage>
+inline bool check_grounding(
+    const Storage& chunks,
+    const Block& def,
+    uint8_t rotationIndex,
+    const glm::ivec3& origin
+) {
+    const auto& vec = get_ground_direction(def, rotationIndex);
+
+    if (def.rt.extended) {
+        const auto& rotation = def.rotations.variants[rotationIndex];
+
+        if (def.groundingBehaviour == GroundingBehaviour::PARTIAL) {
+            for (int sz = 0; sz < def.size.z; sz++) {
+                for (int sx = 0; sx < def.size.x; sx++) {
+                    auto pos = origin;
+                    pos += rotation.axes[0] * sx;
+                    pos += rotation.axes[2] * sz;
+                    if (blocks_agent::is_solid_at(chunks, pos.x + vec.x, pos.y + vec.y, pos.z + vec.z)) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+        else if (def.groundingBehaviour == GroundingBehaviour::COMPLETE) {
+            for (int sz = 0; sz < def.size.z; sz++) {
+                for (int sx = 0; sx < def.size.x; sx++) {
+                    auto pos = origin;
+                    pos += rotation.axes[0] * sx;
+                    pos += rotation.axes[2] * sz;
+                    if (!blocks_agent::is_solid_at(chunks, pos.x + vec.x, pos.y + vec.y, pos.z + vec.z)) {
+                        return false;
+                    }
+                }
+            }
+            return true;
+        }
+        else if (def.groundingBehaviour == GroundingBehaviour::ORIGIN) {
+            return blocks_agent::is_solid_at(chunks, origin.x + vec.x, origin.y + vec.y, origin.z + vec.z);
+        }
+    }
+
+    return blocks_agent::is_solid_at(chunks, origin.x + vec.x, origin.y + vec.y, origin.z + vec.z);
+}
+
 } // blocks_agent