diff --git a/apps/api/app/admin/softwares.rb b/apps/api/app/admin/softwares.rb
index eecbf3a..606946c 100644
--- a/apps/api/app/admin/softwares.rb
+++ b/apps/api/app/admin/softwares.rb
@@ -30,7 +30,7 @@ ActiveAdmin.register Software do
   filter :name
   filter :title
   filter :author
-  filter :platform, as: :select, collection: %w[tic80 ebitengine love]
+  filter :platform, as: :select, collection: %w[tic80 ebitengine love c64]
   filter :status,   as: :select, collection: %w[development demo released archived]
   filter :highlighted
 
@@ -40,7 +40,7 @@ ActiveAdmin.register Software do
         f.input :name
         f.input :title
         f.input :author
-        f.input :platform, as: :select, collection: %w[tic80 ebitengine love]
+        f.input :platform, as: :select, collection: %w[tic80 ebitengine love c64]
         f.input :status,   as: :select, collection: %w[development demo released archived]
         f.input :highlighted
         f.input :license
@@ -78,7 +78,7 @@ ActiveAdmin.register Software do
       f.input :name
       f.input :title
       f.input :author
-      f.input :platform, as: :select, collection: %w[tic80 ebitengine love]
+      f.input :platform, as: :select, collection: %w[tic80 ebitengine love c64]
       f.input :status,   as: :select, collection: %w[development demo released archived]
       f.input :highlighted
       f.input :license
diff --git a/apps/api/app/models/release.rb b/apps/api/app/models/release.rb
index 5a02f90..95a92ec 100644
--- a/apps/api/app/models/release.rb
+++ b/apps/api/app/models/release.rb
@@ -5,6 +5,16 @@ class Release < ApplicationRecord
 
   default_scope { where(deleted_at: nil) }
 
+  validate :c64_cannot_be_web_playable
+
+  def c64_cannot_be_web_playable
+    return unless software&.platform == "c64"
+
+    if html_folder_path.present? || web_playable?
+      errors.add(:base, "C64 releases cannot be web playable (download only)")
+    end
+  end
+
   def self.ransackable_attributes(auth_object = nil)
     %w[cartridge_path created_at deleted_at docs_folder_path html_folder_path id software_id source_path updated_at version web_playable]
   end