Some spammers are hip to the hidden field trick.

Let's see if using a regular input with "display: none" is better.

lib/trap_door.rb

@@ -1,6 +1,6 @@
 module TrapDoor
   mattr_accessor :honeypot_field_name
-  
+
   def self.included(controller)
     self.honeypot_field_name = honeypot_field_name || :affiliate_id
     controller.extend(ClassMethods)
@@ -20,10 +20,11 @@ def check_params
       redirect_to 'http://en.wikipedia.org/wiki/User:Mike_Rosoft/Spambot' unless params[honeypot_field_name.to_sym].blank?
     end
   end
-  
+
   module TrapDoorHelper
     def trap_door_field(options = {})
-      hidden_field_tag(TrapDoor.honeypot_field_name, '', options)
+      options = options.reverse_merge({:style => 'display:none;'})
+      text_field_tag(TrapDoor.honeypot_field_name, '', options)
     end
   end
 end

test/trap_door_test.rb

@@ -28,7 +28,7 @@ def setup
     get :create
     assert_response :success
   end
-  
+
   test "should not redirect if honypot param is blank" do
     get :create, :affiliate_id => ""
     assert_response :success
@@ -48,17 +48,21 @@ def setup
 
 class TrapDoorHelperTest < ActionView::TestCase
   tests TrapDoor::TrapDoorHelper
-  
+
   def setup
     TrapDoor.honeypot_field_name = :affiliate_id
   end
 
   test "should render the trap door field" do
-    assert_dom_equal('<input name="affiliate_id" id="affiliate_id" value="" type="hidden" />', trap_door_field)
+    assert_dom_equal('<input name="affiliate_id" id="affiliate_id" value="" type="text" style="display:none;" />', trap_door_field)
   end
 
   test "should use the user defined honeypot field name" do
     TrapDoor.honeypot_field_name = :spambot_id
-    assert_dom_equal('<input name="spambot_id" id="spambot_id" value="" type="hidden" />', trap_door_field)
+    assert_dom_equal('<input name="spambot_id" id="spambot_id" value="" type="text" style="display:none;" />', trap_door_field)
+  end
+
+  test "should not override user supplied options" do
+    assert_dom_equal('<input name="affiliate_id" id="affiliate_id" value="" type="text" style="font:red;" />', trap_door_field(:style => 'font:red;'))
   end
 end