diff --git a/src/main/java/io/papermc/patchroulette/controller/RESTController.java b/src/main/java/io/papermc/patchroulette/controller/RESTController.java
index 781ec38..7304eb9 100644
--- a/src/main/java/io/papermc/patchroulette/controller/RESTController.java
+++ b/src/main/java/io/papermc/patchroulette/controller/RESTController.java
@@ -1,13 +1,14 @@
 package io.papermc.patchroulette.controller;
 
-import io.papermc.patchroulette.model.Patch;
 import io.papermc.patchroulette.model.PatchId;
 import io.papermc.patchroulette.service.PatchService;
 import java.util.List;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -24,20 +25,22 @@ public RESTController(final PatchService patchService) {
         this.patchService = patchService;
     }
 
+    public record PatchInfo(String path, Integer size) {}
+
     @PreAuthorize("hasRole('PATCH')")
     @GetMapping(
         value = "/get-available-patches",
         produces = "application/json"
     )
-    public ResponseEntity<List<String>> getAvailablePatches(@RequestParam final String minecraftVersion) {
+    public ResponseEntity<List<PatchInfo>> getAvailablePatches(@RequestParam final String minecraftVersion) {
         return ResponseEntity.ok(
             this.patchService.getAvailablePatches(minecraftVersion).stream()
-                .map(Patch::getPath)
+                .map(patch -> new PatchInfo(patch.getPath(), patch.getSize()))
                 .toList()
         );
     }
 
-    public record PatchDetails(String path, String status, String responsibleUser) {}
+    public record PatchDetails(String path, String status, String responsibleUser, Integer size) {}
 
     @PreAuthorize("hasRole('PATCH')")
     @GetMapping(
@@ -47,12 +50,12 @@ public record PatchDetails(String path, String status, String responsibleUser) {
     public ResponseEntity<List<PatchDetails>> getAllPatches(@RequestParam final String minecraftVersion) {
         return ResponseEntity.ok(
             this.patchService.getAllPatches(minecraftVersion).stream()
-                .map(patch -> new PatchDetails(patch.getPath(), patch.getStatus().name(), patch.getResponsibleUser()))
+                .map(patch -> new PatchDetails(patch.getPath(), patch.getStatus().name(), patch.getResponsibleUser(), patch.getSize()))
                 .toList()
         );
     }
 
-    public record Patches(String minecraftVersion, List<String> paths) {}
+    public record Patches(String minecraftVersion, List<PatchInfo> patches) {}
 
     @PreAuthorize("hasRole('PATCH')")
     @PostMapping(
@@ -61,7 +64,7 @@ public record Patches(String minecraftVersion, List<String> paths) {}
         produces = "text/plain"
     )
     public ResponseEntity<String> setPatches(@RequestBody final Patches input) {
-        this.patchService.setPatches(input.minecraftVersion(), input.paths());
+        this.patchService.setPatches(input.minecraftVersion(), input.patches());
         return ResponseEntity.ok("Patches set.");
     }
 
@@ -88,10 +91,30 @@ private String getUser(final Authentication authentication) {
     )
     public ResponseEntity<String> startPatch(final Authentication auth, @RequestBody final PatchId input) {
         final String user = this.getUser(auth);
-        this.patchService.startWorkOnPatch(input, user);
+        final List<String> result = this.patchService.startWorkOnPatches(input.getMinecraftVersion(), List.of(input.getPath()), user);
+        if (result.isEmpty()) {
+            return ResponseEntity.status(HttpStatus.CONFLICT).body("Patch not available.");
+        }
         return ResponseEntity.ok("Patch started.");
     }
 
+    public record PatchList(String minecraftVersion, List<String> patches) {}
+
+    @PreAuthorize("hasRole('PATCH')")
+    @PostMapping(
+            value = "/start-patches",
+            consumes = "application/json",
+            produces = "application/json"
+    )
+    public ResponseEntity<?> startPatch(final Authentication auth, @RequestBody final PatchList input) {
+        final String user = this.getUser(auth);
+        final List<String> result = this.patchService.startWorkOnPatches(input.minecraftVersion(), input.patches(), user);
+        if (result.isEmpty()) {
+            return ResponseEntity.status(HttpStatus.CONFLICT).body("None of the patches are available.");
+        }
+        return ResponseEntity.ok(result);
+    }
+
     @PreAuthorize("hasRole('PATCH')")
     @PostMapping(
         value = "/complete-patch",
@@ -115,4 +138,20 @@ public ResponseEntity<String> cancelPatch(@RequestBody final PatchId input) {
         return ResponseEntity.ok("Patch cancelled.");
     }
 
+    @PreAuthorize("hasRole('PATCH')")
+    @PostMapping(
+            value = "/undo-patch",
+            consumes = "application/json",
+            produces = "text/plain"
+    )
+    public ResponseEntity<String> undoPatch(final Authentication auth, @RequestBody final PatchId input) {
+        final String user = this.getUser(auth);
+        this.patchService.undoPatch(input, user);
+        return ResponseEntity.ok("Patch moved to WIP.");
+    }
+
+    @ExceptionHandler(IllegalStateException.class)
+    public ResponseEntity<String> handleException(final IllegalStateException e) {
+        return ResponseEntity.status(HttpStatus.CONFLICT).body(e.getMessage());
+    }
 }
diff --git a/src/main/java/io/papermc/patchroulette/model/Patch.java b/src/main/java/io/papermc/patchroulette/model/Patch.java
index 73c1925..451ac47 100644
--- a/src/main/java/io/papermc/patchroulette/model/Patch.java
+++ b/src/main/java/io/papermc/patchroulette/model/Patch.java
@@ -22,6 +22,7 @@ public class Patch {
     private Status status;
 
     private String responsibleUser;
+    private Integer size;
 
     public Patch() {
     }
@@ -57,4 +58,12 @@ public String getResponsibleUser() {
     public void setResponsibleUser(final String responsibleUser) {
         this.responsibleUser = responsibleUser;
     }
+
+    public Integer getSize() {
+        return size;
+    }
+
+    public void setSize(Integer size) {
+        this.size = size;
+    }
 }
diff --git a/src/main/java/io/papermc/patchroulette/model/PatchId.java b/src/main/java/io/papermc/patchroulette/model/PatchId.java
index f0c02dd..1f648e9 100644
--- a/src/main/java/io/papermc/patchroulette/model/PatchId.java
+++ b/src/main/java/io/papermc/patchroulette/model/PatchId.java
@@ -13,6 +13,14 @@ public class PatchId implements Serializable {
     public PatchId() {
     }
 
+    public String getMinecraftVersion() {
+        return minecraftVersion;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
     @JsonCreator
     public PatchId(@JsonProperty("minecraftVersion") final String minecraftVersion,
                    @JsonProperty("path") final String path) {
diff --git a/src/main/java/io/papermc/patchroulette/service/PatchService.java b/src/main/java/io/papermc/patchroulette/service/PatchService.java
index 3a22be5..6d1a9b4 100644
--- a/src/main/java/io/papermc/patchroulette/service/PatchService.java
+++ b/src/main/java/io/papermc/patchroulette/service/PatchService.java
@@ -4,11 +4,15 @@
 import io.papermc.patchroulette.model.PatchId;
 import io.papermc.patchroulette.model.Status;
 import io.papermc.patchroulette.repository.PatchRepository;
+
+import java.util.ArrayList;
 import java.util.List;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import static io.papermc.patchroulette.controller.RESTController.PatchInfo;
+
 @Service
 public class PatchService {
 
@@ -20,10 +24,11 @@ public PatchService(final PatchRepository patchRepository) {
     }
 
     @Transactional
-    public void setPatches(final String minecraftVersion, final List<String> paths) {
-        final List<Patch> patches = paths.stream().map(path -> {
+    public void setPatches(final String minecraftVersion, final List<PatchInfo> patchInfos) {
+        final List<Patch> patches = patchInfos.stream().map(patchInfo -> {
             final Patch patch = new Patch();
-            patch.setPath(path);
+            patch.setPath(patchInfo.path());
+            patch.setSize(patchInfo.size());
             patch.setStatus(Status.AVAILABLE);
             patch.setMinecraftVersion(minecraftVersion);
             return patch;
@@ -41,17 +46,23 @@ public List<Patch> getAllPatches(final String minecraftVersion) {
     }
 
     @Transactional
-    public void startWorkOnPatch(final PatchId patchId, final String user) {
-        final Patch patch = this.patchRepository.getReferenceById(patchId);
-        if (patch.getStatus() != Status.AVAILABLE) {
-            throw new IllegalStateException("Patch " + patchId + " is not available");
-        }
-        if (patch.getResponsibleUser() != null) {
-            throw new IllegalStateException("Patch " + patchId + " is already claimed by another user");
+    public List<String> startWorkOnPatches(final String minecraftVersion, final List<String> patches, final String user) {
+        final List<String> startedPatches = new ArrayList<>();
+        for (final String path : patches) {
+            final PatchId patchId = new PatchId(minecraftVersion, path);
+            final Patch patch = this.patchRepository.getReferenceById(patchId);
+            if (patch.getStatus() != Status.AVAILABLE) {
+                continue;
+            }
+            if (patch.getResponsibleUser() != null) {
+                continue;
+            }
+            patch.setStatus(Status.WIP);
+            patch.setResponsibleUser(user);
+            this.patchRepository.save(patch);
+            startedPatches.add(path);
         }
-        patch.setStatus(Status.WIP);
-        patch.setResponsibleUser(user);
-        this.patchRepository.save(patch);
+        return startedPatches;
     }
 
     @Transactional
@@ -78,6 +89,17 @@ public void finishWorkOnPatch(final PatchId patchId, final String user) {
         this.patchRepository.save(patch);
     }
 
+    @Transactional
+    public void undoPatch(final PatchId patchId, final String user) {
+        final Patch patch = this.patchRepository.getReferenceById(patchId);
+        if (patch.getStatus() != Status.DONE) {
+            throw new IllegalStateException("Patch " + patchId + " is not DONE");
+        }
+        patch.setStatus(Status.WIP);
+        patch.setResponsibleUser(user);
+        this.patchRepository.save(patch);
+    }
+
     public void clearPatches(final String minecraftVersion) {
         this.patchRepository.deleteAllByMinecraftVersion(minecraftVersion);
     }