diff --git a/server/src/main/java/ru/dragonestia/picker/controller/InstanceController.java b/server/src/main/java/ru/dragonestia/picker/controller/InstanceController.java
index 4c2109d..6eae3c0 100644
--- a/server/src/main/java/ru/dragonestia/picker/controller/InstanceController.java
+++ b/server/src/main/java/ru/dragonestia/picker/controller/InstanceController.java
@@ -4,49 +4,79 @@ import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import ru.dragonestia.picker.controller.response.ResponseObject;
+import ru.dragonestia.picker.exception.DoesNotExistsException;
+import ru.dragonestia.picker.model.entity.EntityId;
+import ru.dragonestia.picker.model.instance.Instance;
+import ru.dragonestia.picker.model.instance.InstanceId;
 import ru.dragonestia.picker.model.instance.type.PickingMethod;
+import ru.dragonestia.picker.service.EntityService;
+import ru.dragonestia.picker.service.InstanceService;
+import ru.dragonestia.picker.service.RoomService;
 
+import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 @RestController
 @RequestMapping("/instances")
 @RequiredArgsConstructor
 public class InstanceController {
 
+    private final InstanceService instanceService;
+    private final RoomService roomService;
+    private final EntityService entityService;
+
     @GetMapping
     List<String> listInstances() {
-        throw new UnsupportedOperationException("Not implemented");
+        return instanceService.all().stream().map(instance -> instance.getId().getValue()).toList();
     }
 
     @GetMapping("/target/{instanceId}")
     ResponseObject.Instance targetInstanceDetails(@PathVariable String instanceId) {
-        throw new UnsupportedOperationException("Not implemented");
+        var id = InstanceId.of(instanceId);
+        return instanceService.find(id)
+                .map(ResponseObject.Instance::of)
+                .orElseThrow(() -> DoesNotExistsException.forInstance(id));
     }
 
     @GetMapping("/list")
     List<ResponseObject.Instance> listInstancesDetails(@RequestParam List<String> id) {
-        throw new UnsupportedOperationException("Not implemented");
+        return id.stream().map(this::targetInstanceDetails).toList();
     }
 
     @PostMapping
     ResponseEntity<Void> createInstance(@RequestParam String instanceId,
                                         @RequestParam PickingMethod method,
                                         @RequestParam(defaultValue = "false") boolean persist) {
-        throw new UnsupportedOperationException("Not implemented");
+        instanceService.create(new Instance(InstanceId.of(instanceId), method, persist));
+        return ResponseEntity.ok().build();
     }
 
     @DeleteMapping("/target/{instanceId}")
     ResponseEntity<Void> deleteInstance(@PathVariable String instanceId) {
-        throw new UnsupportedOperationException("Not implemented");
+        instanceService.remove(InstanceId.of(instanceId));
+        return ResponseEntity.ok().build();
     }
 
     @DeleteMapping("/list")
     ResponseEntity<Void> deleteInstances(@RequestParam List<String> id) {
-        throw new UnsupportedOperationException("Not implemented");
+        for (var instanceId: id) {
+            deleteInstance(instanceId);
+        }
+        return ResponseEntity.ok().build();
     }
 
     @PostMapping("/target/{instanceId}/pick")
-    ResponseObject.PickedRoom pickRoom(@PathVariable String instanceId, @RequestBody List<String> entities) {
-        throw new UnsupportedOperationException("Not implemented");
+    ResponseObject.PickedRoom pickRoom(@PathVariable String instanceId,
+                                       @RequestParam(defaultValue = "false") boolean dontReturnEntities,
+                                       @RequestBody List<String> entities) {
+        var room = roomService.pick(InstanceId.of(instanceId), entities.stream().map(EntityId::of).collect(Collectors.toSet()));
+        List<String> returnEntities = new ArrayList<>();
+        if (!dontReturnEntities) {
+            for (var entity: entityService.getRoomEntities(room)) {
+                returnEntities.add(entity.getId().getValue());
+            }
+        }
+        return new ResponseObject.PickedRoom(ResponseObject.Room.of(room), returnEntities);
     }
 }
diff --git a/server/src/main/java/ru/dragonestia/picker/controller/response/ResponseObject.java b/server/src/main/java/ru/dragonestia/picker/controller/response/ResponseObject.java
index 0ca87fb..1dcab03 100644
--- a/server/src/main/java/ru/dragonestia/picker/controller/response/ResponseObject.java
+++ b/server/src/main/java/ru/dragonestia/picker/controller/response/ResponseObject.java
@@ -9,11 +9,26 @@ public final class ResponseObject {
 
     private ResponseObject() {}
 
-    public record Instance(String id, PickingMethod method, boolean persist) {}
+    public record Instance(String id, PickingMethod method, boolean persist) {
 
-    public record Room(String id, String nodeId, int slots, boolean locked, boolean persist, String payload) {}
+        public static ResponseObject.Instance of(ru.dragonestia.picker.model.instance.Instance instance) {
+            return new Instance(instance.getId().getValue(), instance.getPickingMethod(), instance.isPersist());
+        }
+    }
 
-    public record PickedRoom(Room room, List<EntityId> entities) {}
+    public record Room(String id, String nodeId, int slots, boolean locked, boolean persist, String payload) {
+
+        public static ResponseObject.Room of(ru.dragonestia.picker.model.room.Room room) {
+            return new Room(room.getId().getValue(),
+                    room.getInstance().getId().getValue(),
+                    room.getSlots(),
+                    room.isLocked(),
+                    room.isPersist(),
+                    room.getPayload());
+        }
+    }
+
+    public record PickedRoom(Room room, List<String> entities) {}
 
     public record Account(String id, List<String> permissions, boolean locked) {}
 }
diff --git a/server/src/main/java/ru/dragonestia/picker/service/InstanceService.java b/server/src/main/java/ru/dragonestia/picker/service/InstanceService.java
index dcedbe8..9de58b4 100644
--- a/server/src/main/java/ru/dragonestia/picker/service/InstanceService.java
+++ b/server/src/main/java/ru/dragonestia/picker/service/InstanceService.java
@@ -15,7 +15,7 @@ public interface InstanceService {
     void create(Instance instance) throws InvalidIdentifierException, AlreadyExistsException;
 
     @PreAuthorize("hasRole('NODE_MANAGEMENT')")
-    void remove(Instance instance);
+    void remove(InstanceId id);
 
     List<Instance> all();
 
diff --git a/server/src/main/java/ru/dragonestia/picker/service/impl/InstanceServiceImpl.java b/server/src/main/java/ru/dragonestia/picker/service/impl/InstanceServiceImpl.java
index 6bb30ad..9788c6e 100644
--- a/server/src/main/java/ru/dragonestia/picker/service/impl/InstanceServiceImpl.java
+++ b/server/src/main/java/ru/dragonestia/picker/service/impl/InstanceServiceImpl.java
@@ -29,13 +29,13 @@ public class InstanceServiceImpl implements InstanceService {
     }
 
     @Override
-    public void remove(Instance instance) {
-        for (var room: roomRepository.all(instance.getId())) {
+    public void remove(InstanceId id) {
+        for (var room: roomRepository.all(id)) {
             storage.removeRoom(room);
         }
 
-        instanceRepository.delete(instance.getId());
-        storage.removeInstance(instance);
+        instanceRepository.delete(id);
+        storage.removeInstance(id);
     }
 
     @Override
diff --git a/server/src/main/java/ru/dragonestia/picker/storage/InstanceAndRoomStorage.java b/server/src/main/java/ru/dragonestia/picker/storage/InstanceAndRoomStorage.java
index da5d787..ebe76e3 100644
--- a/server/src/main/java/ru/dragonestia/picker/storage/InstanceAndRoomStorage.java
+++ b/server/src/main/java/ru/dragonestia/picker/storage/InstanceAndRoomStorage.java
@@ -1,6 +1,7 @@
 package ru.dragonestia.picker.storage;
 
 import ru.dragonestia.picker.model.instance.Instance;
+import ru.dragonestia.picker.model.instance.InstanceId;
 import ru.dragonestia.picker.model.room.Room;
 
 public interface InstanceAndRoomStorage {
@@ -9,7 +10,7 @@ public interface InstanceAndRoomStorage {
 
     void saveInstance(Instance instance);
 
-    void removeInstance(Instance instance);
+    void removeInstance(InstanceId id);
 
     void saveRoom(Room room);
 
diff --git a/server/src/main/java/ru/dragonestia/picker/storage/impl/FileStorageImpl.java b/server/src/main/java/ru/dragonestia/picker/storage/impl/FileStorageImpl.java
index 5844166..3c4d186 100644
--- a/server/src/main/java/ru/dragonestia/picker/storage/impl/FileStorageImpl.java
+++ b/server/src/main/java/ru/dragonestia/picker/storage/impl/FileStorageImpl.java
@@ -9,6 +9,7 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Component;
 import ru.dragonestia.picker.model.instance.Instance;
+import ru.dragonestia.picker.model.instance.InstanceId;
 import ru.dragonestia.picker.model.room.Room;
 import ru.dragonestia.picker.repository.InstanceRepository;
 import ru.dragonestia.picker.repository.RoomRepository;
@@ -77,11 +78,12 @@ public class FileStorageImpl implements InstanceAndRoomStorage {
     }
 
     @Override
-    public void removeInstance(Instance instance) {
-        if (!instance.isPersist()) return;
-        new File(path + "/nodes/" + instance.getId() + ".json").delete();
+    public void removeInstance(InstanceId id) {
+        var file = new File(path + "/nodes/" + id + ".json");
+        if (!file.exists()) return;
+        file.delete();
 
-        log.info("Removed instance '%s' from disk storage".formatted(instance.getId()));
+        log.info("Removed instance '%s' from disk storage".formatted(id));
     }
 
     @SneakyThrows
diff --git a/server/src/main/java/ru/dragonestia/picker/storage/impl/NullStorageImpl.java b/server/src/main/java/ru/dragonestia/picker/storage/impl/NullStorageImpl.java
index 8003503..a201d29 100644
--- a/server/src/main/java/ru/dragonestia/picker/storage/impl/NullStorageImpl.java
+++ b/server/src/main/java/ru/dragonestia/picker/storage/impl/NullStorageImpl.java
@@ -3,6 +3,7 @@ package ru.dragonestia.picker.storage.impl;
 import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Component;
 import ru.dragonestia.picker.model.instance.Instance;
+import ru.dragonestia.picker.model.instance.InstanceId;
 import ru.dragonestia.picker.model.room.Room;
 import ru.dragonestia.picker.storage.InstanceAndRoomStorage;
 
@@ -17,7 +18,7 @@ public class NullStorageImpl implements InstanceAndRoomStorage {
     public void saveInstance(Instance instance) {}
 
     @Override
-    public void removeInstance(Instance instance) {}
+    public void removeInstance(InstanceId id) {}
 
     @Override
     public void saveRoom(Room room) {}